calculate the work wbc done by the electrostatic force on the charged particle as it moves from b to c.

An increase in the spring constant changes will result in a larger frequency for an oscillating spring-mass system.

The mass spring system is a system composed of objects that have mass and are connected to springs. The spring circuit can be composed of several springs mounted in series or parallel as needed. Springs connected in series will decrease the value of the spring constant, while the installation of springs in parallel will increase the value of the spring constant.

Spring system formation is a simple spring system formation arranged in series or parallel. The stages of the research carried out included determining the mathematical equation for mass movement determined from the equilibrium position in the formation of a spring system, including a spring system of a mass connected to two springs arranged in series, a spring system of a mass connected to two springs arranged in parallel and a spring system of two masses. connected by two springs arranged in series, then create a spring system simulation program.

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Sally's observation that the water bottle appeared untouched while the acetone bottle was empty can be explained by the stronger cohesive forces between the water molecules compared to the acetone molecules. The water molecules stick together more tightly, preventing them from evaporating as quickly as the acetone molecules

Sally's statement that particles in water stick together more is partially correct. The cohesive forces between the particles in water, also known as hydrogen bonds, are indeed stronger than the intermolecular forces between the particles in acetone, which are dipole-dipole interactions.

The strength of the intermolecular forces between particles is determined by the type of chemical bonding and the molecular structure of the substance. In the case of water, the oxygen atom in each molecule attracts electrons more strongly than the two hydrogen atoms, giving rise to partial negative charges around the oxygen and partial positive charges around the hydrogen. This creates an electrostatic attraction between neighboring water molecules, resulting in hydrogen bonding.

On the other hand, acetone molecules have a polar covalent bond between the carbon and oxygen atoms, resulting in partial positive and negative charges. The intermolecular forces between acetone molecules are weaker than those between water molecules, because the dipole moments in acetone are not as large as the dipole moments in water.

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The car's speed just after the gravel is loaded is 4.00 m/s.

The momentum of the system (railroad car + gravel) is conserved before and after the gravel is dropped.

Therefore, we can use the law of conservation of momentum to find the velocity of the combined system just after the gravel is loaded.

Before the gravel is dropped, the momentum of the railroad car is:

p1 = m1v1 = (10000 kg)(8.00 m/s) = 80000 kg*m/s

where m1 is the mass of the railroad car and v1 is its velocity.

When the gravel is dropped, the total mass of the system becomes:

m2 = m1 + m_gravel = 10000 kg + 6000 kg = 16000 kg

where m_gravel is the mass of the gravel.

The momentum of the system just after the gravel is dropped is:

p2 = m2v2

where v2 is the velocity of the combined system just after the gravel is loaded.

Since momentum is conserved, we can equate p1 to p2:

p1 = p2

m1v1 = m2v2

Solving for v2, we get:

v2 = (m1v1) / m2

Substituting the given values, we have:

v2 = (10000 kg)(8.00 m/s) / 16000 kg

v2 = 4.00 m/s

Therefore, the car's speed just after the gravel is loaded is 4.00 m/s.

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The y component of the velocity vector is 10 m/s. Then the v is 12.86 m/s. Now the x component of this velocity is v sin θ.That is , x component is 8 m/s.

Velocity of an object is the measure of its distance travelled per unit time. Velocity is a vector quantity thus having both magnitude and acceleration. The magnitude is called speed.

For a velocity vector there are three translation components possible for three different axes.

here, x component = v sinθ

y component = v cos θ

Given that v cos θ = 10 m/s

θ = 39

Vy = v cos 39 = 10 m/s

then v = 12.8 m/s

Now, the x component is calculated as:

vx = 12.8 m/s sin 39 = 8 m/s.

Therefore, the x component of velocity here is 8 m/s.

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Eau Gaullie treatment a) expected flow rate is 1852 gpm. b) Tank diameter is 41.7 ft. c) input power is 21.1 hP

From flow in tank coefficient equation C_Q = Q/(W×D³)

Q ∝ d³

Qd₁/Qd₂ = d₁³/d₂³

where Eau Gaullie treatment Qd₁ and Qd₂ are different discharges with respect to different diameter, (Qd₁ = 3200 gpm) and d₁ is diameter one ( 12 in) while d₂ is diameter 2 ( 10 in),

now we substitute

Qd₂ = Qd₁(d₂³/d₁³)

Qd₂ = 3200( 10/12)³

Qd₂ = 1852 gpm

∴ expected flow rate is 1852 gpm

next we calculate the head

h ∝ d²

hd₁/hd₂ = d₁²/d₂²

where hd₁ and hd₂ are different heads with respect to different diameter, (hd₁ = 60 ft) and d₁ is diameter one ( 12 in) while d₂ is diameter 2 ( 10 in),

now we substitute

hd₂ = hd₁(d₂²/d₁²)

hd₂ = 60 ( 10/12 )²

hd₂ = 41.7 ft

∴ head is 41.7 ft

Now calculate the input power

W ∝ d⁵

Wd₁/Wd₂ = d₁⁵/d₂⁵

where Wd₁ and Wd₂ are different power with respect to different diameter, (Wd₁ = 60 hp) and d₁ is diameter one ( 12 in) while d₂ is diameter 2 ( 10 in),

now we substitute

Wd₂ = Wd₁(d₂⁵/d₁⁵)

Wd₂ = 60 ( 10/12 )⁵

Wd₂ = 21.1 hP

∴ input power is 21.1 hP

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The correct answer of the angular speed and linear speed respectively is option A) 0.1047,0.01047

To find the angular speed of the second hand of a clock, we use the formula:

Angular speed = 2π / time

Since the second hand of a clock completes one full rotation every 60 seconds, the time is 60 seconds. Therefore:

Angular speed = 2π / 60

Angular speed = 0.1047 rad/s

To find the linear speed of the tip of the second hand, we use the formula:

Linear speed = angular speed x radius (v = ωr)

Since the radius of the second hand is 10cm or 0.1m, we can plug in the values:

Linear speed = 0.1047 x 0.1

Linear speed = 0.01047 m/s

Therefore, the angular speed of the second hand of a clock is 0.1047 rad/s and the linear speed of its tip is 0.01047 m/s.

The correct answer to the angular speed and linear speed is therefore option A) 0.1047, 0.01047.

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The new potential difference when the distance between the plates vary is calculated to be 0.5 V. Correct option is C.

The parallel plate capacitor's area is denoted by the letter A.

Distance between the plates is d.

Potential difference is V.

If the distance is reduced to d/2, the potential difference is to be found out.

We know that, Q = C V

To find out potential difference, make it as subject,

V = Q/C

From the above equation, it is seen that, capacitance is inversely proportional to potential difference.

So,  V C = k

where,

k is contant

The parallel plate capacitor's capacitance is stated as,

C = εA/d

When the distance apart is d. Then, C₁ = εA/d

When the distance is half d/2

C₂ = εA/(d/2)

C₂ = 2εA/d

Then, applying V C = k

V₁ is voltage of the full capacitor V1 = V

V₂ is the required voltage let say V'

Then,

V₁ C₁ = V₂ C₂

V × εA/d=V' × 2εA/d

VεA/d = 2V'εA/d

Then the εA/d cancels on both sides and remains

V = 2V'

Then, V' = V/2

Thus, the potential difference is half when the distance between the parallel plate capacitor was reduce to d/2.

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The standing wave can be obtained by taking the sum of the two traveling waves with equal amplitude and opposite phase velocities. To do this, we can use the trigonometric identity:

sin(A) + sin(B) = 2 cos((A+B)/2) sin((A-B)/2)

Ey = 2 E0 cos(wt) sin(kx)

This represents a standing wave with nodes (zero amplitude) at x = nλ/2k, where n is an integer.

Similarly, for the magnetic field Bz, we have:

Bz = 2 B0 cos(wt) sin(kx)

S = E x B

where x represents the vector cross product. Substituting the expressions for E and B, we get:

S = E0 B0 sin^2(kx) / μ0

where μ0 is the permeability of free space.

The Poynting vector is zero when sin^2(kx) = 0, which occurs at x = nπ/k for n an integer. This represents positions where the electric and magnetic fields are out of phase and the energy flow is momentarily zero.

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The horizontal component of acceleration is always zero is the quantities are zero throughout the flight.

What is acceleration?

Acceleration was the representation rate In a change of velocity because the acceleration always depends on the object's speed. Acceleration determines the rate of the particles. Acceleration is the vector quantity. It is a vector quantity, but it has both extent and movement. Newton's law also has the acceleration of the magnitude described. The m.s-2 is the standard unit for acceleration.

What is velocity ?

The most important metric for determining an object's position and rate of movement is its velocity. The distance that an object travels in a certain amount of time might be used to define it. The object's displacement in a unit of time is referred to as velocity.

Therefore, The horizontal component of acceleration is always zero is the quantities are zero throughout the flight.

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The motion of the kangaroo is under free-fall, its vertical speed when it leaves the ground 7.00m/s and it is in air for 1.43s.

The stir of the kangaroo is under free- fall. We're looking for the original haste, and we know that the haste in the loftiest position is zero.

From,

v ² = ( vo) ² 2ay,

we have,

v ² = ( vo) ² 2ay,

v ²- 2ay = vo ²

vo = √ v ²- 2ay

Vo = 7.00 m/ s

thus, the perpendicular speed of the kangaroo when it leaves the ground is 7.00 m/s.

Since the stir of the kangaroo has invariant acceleration, we can use the formula,

y = vo * t1/2 at ²

7t-4.905 t ²

t = 0 or t = 1.43

thus, kangaroo is about 1.43 seconds long in the air.

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Complete question:

A kangaroo can jump over an object 2.50 m high. (a) Calculate its vertical speed when it leaves the ground. (b) How long is it in the air?

During Stage 1, the heat equation that governs the temperature distribution T(x, t) in the pan bottom is given by:

ρc_p∂T/∂t = k∂^2T/∂x^2 + q_0/V

The boundary conditions are:

At x = 0 (the surface in contact with the stove), the temperature is fixed at Ti, and there is no heat flux:

T(x=0,t) = Ti, ∂T/∂x = 0

At x = L (the surface in contact with the water), the heat flux is given by:

-k(∂T/∂x) = h(Tb - T)

The initial condition is:

T(x, t=0) = Ti

Note that the properties of the pan material, including ρ, c_p, and k, need to be specified in order to solve the heat equation.

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The geologist sees depositional contact. Therefore, option A is correct.

A sedimentary or volcanic rock is said to have been deposited on an older rock at a depositional contact (of any type). Where volcanic rocks encroach on older rock, this is known as an intrusive contact (of any type).

The ten different types of contacts are as follows: (1) bedding planes, (2) diastems, (3) angular irregularities, (4) disconformities, (5) para-conformities, (6) nonconformities, (7) pedologic contacts, (8) faults, 9) intrusive contacts, and 10) extrusive contacts.

Hence, option A is correct.

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your question is incomplete, most probably the full question is this:

what a geologist sees. a geology student sits beside an outcrop on mont royal, the namesake of montreal. this exposure shows the intrusion of molten basalt into preexisting limestone.

Answer:n to the right to the right

Explanation:

(a). Elasticity of supply between W and X is elastic.

(a)-1.The supply elasticity relationship Y and Z becomes inelastic.

b. The assertion is accurate.

Like a dishwasher or a car, these are infrequently acquired things that can be put off if the price increases. Elasticity is a crucial economic metric because it shows how much of an item or service consumers consumes when the price varies, which is especially essential for businesses that sell goods or services. That whenever a commodity is elastic, a price fluctuation prompts a shift in demand for it rapidly.

Economists use elasticity to determine how different factors interact. Pricing, cross-price quantity demanded, and quantity demanded are the three main types of elasticity. Goods' elasticity gauges how sensitive they are to price changes.

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The tension force is 15 N.

Tension force is a pulling force transmitted through a flexible medium, such as a rope or cable, when it is pulled at both ends. It is directed along the length of the medium and is equal in magnitude at both ends.

In this case we have been told that A 5-kg block is suspended by a rope from the ceiling of an elevator that accelerates downward at 3.0 m/s2 .

We know that the tension force is the force that acts along the rope hence;

Tension = ma

= 5 Kg * 3.0 m/s2

= 15 N

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The equation gives the capacitance of a parallel-plate capacitor:C = εA/d. Where C is the capacitance, ε is the permittivity of the dielectric material between the plates, A is the area of each plate, and d is the distance between the plates.

In this case, the area of each plate is 10 cm × 20 cm = 200 cm^2 = 0.02 m^2. The distance between the plates is 2.0 mm = 0.002 m. The permittivity of the dielectric material is ε = ε0εr, where ε0 is the vacuum permittivity (8.85 × 10^-12 F/m), and εr is the relative permittivity or dielectric constant (4.1).

So, substituting these values into the equation, we get:

C = εA/d

= (ε0εr)(0.02)/(0.002)

= (8.85 × 10^-12)(4.1)(0.02)/(0.002)

= 7.26 × 10^-11 F

= 72.6 pF

Therefore, the capacitance parallel-plate capacitor is 72.6 pF.

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A collision that is elastic occurs when there is no net loss of kinetic energy in the system as a result of the collision. Kinetic energy and momentum are both conserved in elastic collisions.

When two balls collide at a pool table, that is an instance of an elastic collision. When you throw a ball on the ground and it bounces back into your hand, there is no net change in the kinetic energy, making it an elastic collision.

Two balls colliding at a pool table is an example of an elastic collision. When a ball is tossed to the ground and subsequently returns to your hand, there is no net change in the kinetic energy, making it an elastic collision.

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A) and B): No force whenever, F(t) = 0, ∀t. C): A constant force,

F(t) = F0,∀t.

Newton's Laws

In the year 1687, Isaac Newton distributed his fundamental work "Philosophiae Naturalis Principia Mathematica", in which he included three essential standards of movement. These standards are referred to now as Newton's maxims or Newton's laws.

A) and B): No force whenever,

F(t) = 0, ∀t.

As indicated by Newton's most memorable regulation, an article moves with constant velocity when no net force is following up on it.

C): A constant force,

F(t) = F0,∀t.

As indicated by Newton's subsequent regulation, the speed increase is corresponding to the acting force. Assuming that the speed increase is constant, the force is constant.

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a) The multiplicative factor by which the sound intensity decreases as you go from the first to the second site is 64.

b) The additive amount by which the sound level intensity decreases as you go from the first to the second site is -15.56 dB.

a) The intensity of the sound is measured in decibels and the sound intensity level with the intensity I is calculated by the expression,

β(dB) = 10 log(I/I₀)

where,

β/dB is the intensity level

I is sound intensity

The intensity is given by the relation,

Intensity = Power/Area

I = (P/πr²)

Intensity is inversely related to the square of radius.

I₁/I₂ = (r₂/r₁)² = (8/1)² = 64

I₁ = 64 I₂

So, the multiplicative factor is 64.

b) The formula for the intensity level is given by,

β(dB) = 10 log(I/I₀)

β₁ = 10 dB log(I₁/I₀)

β₂ = 10 dB log(I₂/I₀)

β₂ - β₁ = 10 dB[log(I₂/I₀) - log(I₁/I₀)]

β₂ - β₁ = 10 dB log(I₂/I₁)

β₂ - β₁ = 10 dB log(1/36) = -15.56 dB

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(a) The rate of temperature increase is about 1.40 degrees Celsius per second. (b) It would take about 1428.57 seconds or 23.81 minutes to obtain a temperature increase of 2000 degrees Celsius.

(a) The rate of temperature increase can be calculated by first finding the total energy being transferred per second by the decay of fission products, which is 150 MW. This is equivalent to 150 x 10⁶ J/s. Then, we can use the formula:

rate of temperature increase = (energy transferred per second) / (mass x specific heat)

Plugging in the values, we get:

rate of temperature increase = (150 x 10⁶ J/s) / (1.60 x 10⁵ kg x 0.3349 kJ/kg∘C)
rate of temperature increase ≈ 1.40∘C/s

Therefore, the rate of temperature increase is about 1.40 degrees Celsius per second.

(b) To find the time it would take to obtain a temperature increase of 2000 degrees Celsius, we can use the formula:

time = (change in temperature) / (rate of temperature increase)

Plugging in the values, we get:

time = (2000∘C) / (1.40∘C/s)
time ≈ 1428.57 s

Therefore, it would take about 1428.57 seconds or 23.81 minutes to obtain a temperature increase of 2000 degrees Celsius.

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Complete question:

Even when shut down after a period of normal use, a large commercial nuclear reactor transfers thermal energy at the rate of 150 MW by the radioactive decay of fission products. This heat transfer will cause a rapid increase in temperature if the cooling system fails.

(a) Calculate the rate of temperature increase, in degrees Celsius per second (°C/s), if the mass of the reactor core is 1.4 × 105 kg and it has an average specific heat of 0.3349 kJ/(kg.°C).

(b) How long, in minutes, would it take for the temperature to increase by 2000°C, which could cause some metals holding the radioactive materials to melt? (The initial rate of temperature increase would be greater than that calculated here because the heat transfer is concentrated in a smaller mass. Later, however, the temperature increase would slow down because the 5 x 105-kg steel containment vessel would also begin to heat up.)

Circulation of heat in the oceans and atmosphere is an example of energy movement through convection.

The movement of heat energy through a fluid is known as convection. This kind of heating is most frequently seen in the kitchen, typically with a liquid that is brought to a boil. The air that makes up the atmosphere behaves like a fluid. The rocks are warmed up as a result of the sun's radiation penetrating the ground.

As a result of conduction, the temperature of the rock will increase, which will cause heat energy to be released into the environment. This will result in the formation of a bubble of air that is warmer than the air around it. This pocket of air climbs into the atmosphere and continues its journey. The heat that was held within the bubble dissipates into the atmosphere as it rises, causing the bubble to gradually become cooler.

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To answer the question: "A student made a model of isostasy by placing a block of wood in a beaker of water how can a student demonstrate isostaic rebound using her model?" If she "Press the block down and let go

The state of gravitational equilibrium between the Earth's crust and mantle known as isostasy or isostatic equilibrium causes the crust to "float" at an elevation that is dependent on its thickness and density.

This idea is used to explain how various topographic heights can occur on the surface of the Earth.

Hence, to test the model she has, she should press the block down and let go

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A student made a model of isostasy by placing a block of wood in a beaker of water how can a student demonstarte isostaic rebound using her model

A. Blow vigorously on the block

B. Press the block down and let go

C. Add water until the beaker overflow

D. Pour out all the water

The required velocity and acceleration of this particle when position of the particle is given are never zero. Correct option is D.

The position of the particle is given as x = 3t³ - 6t, y = t² - 2t

The particle's velocity is determined by,

v = dx/dt i + dy/dt j = (9t² - 6) i +  (2t - 2) j

The velocity at the point t = 0 is,

v = (9t² - 6) i +  (2t - 2) j = - 6 i - 2 j

The velocity at the point t = 1 is,

v = (9t² - 6) i +  (2t - 2) j = 3 i

The acceleration of the particle is,

a = d²x/dt² i + d²y/dt² j = 18t i + 2 j

The particle's acceleration at time zero is,

a = 2 j

Thus, the velocity and acceleration of this particle are never zero.

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The heats gained by cold water in trials 1, 2 and 3 are 3048.6 J, 4311.52 J and 3048.6 J respectively and the heat lost are -6858 J, -4307.84 J and -3593.9 J respectively.

Calculation of Heat Gained by Cold Water:

Trial 1:

Q = (m)(c)(Δ T)

Q = (0.25 kg)(4186 J/(kg x C°))(36°C)

Q = 3048.6 J

Trial 2:

Q = (m)(c)(Δ T)

Q = (0.2 kg)(4186 J/(kg x C°))(52°C)

Q = 4311.52 J

Trial 3:

Q = (m)(c)(Δ T)

Q = (0.3 kg)(4186 J/(kg x C°))(26°C)

Q = 3048.6 J

Calculation of Heat Lost by Hot Water:

Trial 1:

Q = (m)(c)(Δ T)

Q = (0.25 kg)(4186 J/(kg * C°))(-52°C)

Q = -6858 J

Trial 2:

Q = (m)(c)(Δ T)

Q = (0.4 kg)(4186 J/(kg x C°))(-26°C)

Q = -4307.84 J

Trial 3:

Q = (m)(c)(Δ T)

Q = (0.15 kg)(4186 J/(kg x C°))(-75°C)

Q = -3593.9 J

Comparison of Heat Gain and Heat Loss:

In all three trials, the heat lost by the hot water is not equal to the heat gained by the cold water. This discrepancy is likely due to errors in the measurement of the temperature and volume of the water, or due to heat loss to the environment.

Conclusion:

This activity allowed the student to investigate heat transfer and thermal energy conservation. Through the measurement of the temperature of hot and cold water and the calculation of heat gained and lost by each, the student was able to gain a better understanding of these concepts. However, it is important to note that the results may have been affected by errors in measurement, so further experimentation and refinement of techniques may be necessary to obtain more accurate results.

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The true statement about the motion of the helicopter is " the helicopter travels at a greater speed between D and E than it did between A and B.

option D.

Motion is the process of an object changing its position with respect to a reference point over time. It involves the movement of an object from one point in space to another.

Motion can be described in terms of its speed, direction, and acceleration. Speed refers to the rate at which an object is moving, while direction refers to the path that the object is following. Acceleration refers to the rate at which an object's speed or direction changes.

v = Δx / Δt

where;

The change in position of the helicopter between A and B = 0

because, A = 100 m and B = 100 m

so the speed of the helicopter between A and B = 0 m/s.

Thus, the last statement is the only correct option,

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The rate constant be at 172.0°C  is 1.11 x10⁵ m⁻¹s⁻¹

We employ the Arrhenius equation, which is: to determine the rate constant for the reaction at two different temperatures.

Ln(k  172.0°C/ k 201°C) = Ea/R (1/T₁ - 1/T₂)

where,  

k 201°C = equilibrium constant at  201°C = 5x 10⁴m⁻¹s⁻¹

k 172.0°C = equilibrium constant at 172.0°C = ?

Ea = Activation energy = 30.0 kJ/mol = 30000 J/mol   (Conversion factor:  1 kJ = 1000 J)

R = Gas constant = 8.314 J/mol K

T₁ = initial temperature = 201°C =  474°K

T₂ = final temperature =   172.0°C = 445 °K

Putting the value

Ln(k  172.0°C/ k 201°C) = 30000 J/mol /8.314 J/mol K (1/ 474°K - 1/445 °K)

k 172.0°C = 1.11 x10⁵ m⁻¹s⁻¹

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Equation to solve for v:v = sqrt(u² + 2as)Substituting the given values, we get:v = sqrt((25.7 m/s)² + 2(-9.8 m/s²)(16.1 m))v = 14.9 m/s

It is a scalar quantity that represents the speed at which an item moves or changes position with respect to time.

A) To determine the initial velocity required to clear the river and land safely on the other side, we need to use the following equation d = vt + (1/2)at²

Where d is the distance the car needs to travel horizontally, which is the width of the river (68 m).v is the initial velocity of the car. An is the acceleration due to gravity (-9.8 m/s²).

T is the time the car spends in the air. We can rearrange this equation to solve for v:v = (d – (1/2)at²) / substituting the given values, we get:v = (68 m – (1/2)(-9.8 m/s²)(18.1 m)²) / (2(18.1 m)/v)v = 25.7 m/s

B) To determine the speed of the car just before it lands on the other side, we can use the following equation: where:u is the initial velocity of the car. An is the acceleration due to gravity (-9.8 m/s²).s  [tex]v^² = u^² + 2as[/tex]is the vertical distance the car travels from the cliff to the other side (18.1 m – 2 m = 16.1 m).

Therefore, (A) To clear the river and safely land on the other side, the car must be moving at a speed of 25.7 m/s (or approximately 92.5 km/h) immediately as it exits the cliff.

(B) The car is travelling at a speed of 14.9 m/s, or approximately 53.6 km/h, shortly before it safely falls on the opposite side.

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A car comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side the car is on is 18.1 m above the river, whereas the opposite side is a mere 2 m above the river. The river itself is a raging torrent 68 m wide.A) How fast should the car be travelling just as it leaves the cliff in order to just clear the river and land safely on the opposite side? B) What is the speed of the car just before it lands safely on the other side?

The velocity of the object both horizontally and vertically at 2.00 seconds is (A) 8.7 m/s and - 14.6 m/s. The result is obtained by us using formula for projectile motion.

In horizontal motion, the velocity is not affected by the gravitational acceleration. It can be calculated by

vx = v₀ cos θ

In vertical motion, the velocity is affected by the gravitational acceleration. It ca be expressed as

vy = v₀ sin θ - gt

An object is moving in projectile motion.

we have:

The horizontal velocity of the object is

vx = 10.0 × Cos 30°

vx = 10.0 × ½ √3

vx = 5√3

vx = 8.7 m/s

The vertical velocity of the object is

vy = v₀ sin 30 - gt

vy = 10.0 (½) - 9.8 (2.00)

vy = 5 - 19.6

vy = - 14.6 m/s

Hence, the velocity of the object is vx = 87 m/s and vy = - 14. m/s.

The correct option is (A).

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According to the question, the work done by a car is calculated as 144Nm.

Force may be defined as a process of pushing or pulling on an object that significantly produces acceleration in the body on which it acts. It is an external agent capable of changing a body's state of rest or motion. It has a magnitude and a direction.

According to the question,

The force applied on a car = 18 N

The displacement made by a car = 8m.

Now, the work done is calculated with the help of the given formula:

                           = 18 N × 8m = 144Nm.

Therefore, the work done by a car is calculated as 144Nm.

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Answer: Acceleration, a= -1.11*10^-5

Explanation:

Using a= (V(final speed)- U(Initial speed) )/ TIME IN SECONDS

5hr to seconds is 5*60*60=18,000s

(2.8m/s-3m/s)/ 18,000s = -1.11*10^-5

I'm sorry I wasn't able to explain well, but I hope this helps.