Physics High School

A bicyclist is finishing his repair of a flat tire when a friend rides by with a constant speed of 3.5 m>s. Two seconds later the bicyclist hops on his bike and accelerates at 2.4 m>s2 until he catches his friend. (a) How much time does it take until he catches his friend

Answers

Answer 1

Answer:

4.28 s

Explanation:

after two seconds (2 s) His friends is

d = 3.5 m/s x 2 s = 7 meter ahead.

in this state, a bicylist start from initial velocity vo = 0 m/s and accelerat 2.4 m/s²

then, when bicylist reach his friend

t friend = t bicyclist = t

d bicylist = d friend + d

-------

d friend = 3.5 . t

d bicylist = vo . t + ½ a t²

d friend + d = vo . t + ½ a t²

3.5 t + 7 = 0 . t + ½ . 2.4 . t²

3.5 t + 7 = 1.2 t²

0 = 1.2 t² - 3.5 t - 7

t = -1.363 and t = 4.28

take the positive one

Related Questions

What force is required to give an object with mass 50 kg an acceleration of 8 m/s2 O A. 6.25 N O B. 58 N O C, 400 N O D, 250 N​

Answers

Answer:

C, 400 N

Explanation:

Given parameters:

Mass of object  = 50kg

Acceleration  = 8m/s²

Unknown:

Amount of force  = ?

Solution:

According to Newton's second law of motion;

       Force  = m a

m is the mass

a is the acceleration

 Now insert the parameters and solve;

   Force  = 50  x  8  = 400N

Uses of lens and mirror in daily life

Answers

Answer:

Decorating. Because mirrors reflect light, they create an illusion of open space by doubling whatever is in a room. ...

Safety. People use mirrors and lenses for safety. ...

Vision. Eye doctors use lenses to correct vision. ...

Magnification and Science. ...

Energy and Affirmation Techniques. ...

Photography. ...

A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this person is standing on a bathroom scale inside the elevator, what would the scale read?

Answers

Answer:

The scale will read less than 700 N

Explanation:

Given;

normal weight of the person, W = 700 N

The upward acceleration of the elevator is given by Newton's second law of motion;

F = ma

Also, the weight of the person, W = mg

Net force on the person when the elevator accelerates upward is given as;

R = ma + mg

When the elevator slows down at a steady rate, then net force on the person is given as;

R = mg - ma

R = m(g - a), this net force on the person is also the reading of the scale.

Thus, the scale will read less than 700 N.

Answer: The answer is less than 700 N

Other Questions
answer correctly please and you will get brainliest A 5-kg projectile is fired over level ground with a velocity of 200 m/s at an angle of 25above the horizontal. Just before it hits the ground its speed is 150 m/s. Over the entire trip thechange in the thermal energy of the projectile and air is: DUE IN 5 MINWhich of the following was not part of Alexander Hamilton's financial plan for the United States?Group of answer choicestaxes on importsaid to farmerstaking over state debtscreating a bank A recipe uses 3 tbspoons of olive oil for every 2 cloves of garlic. How many cloves for every 1 tbspoons of oil? Match the exercise with the muscle or muscle group it exercises. -3x + 12 = -36solve for x Read the excerpt from Tools of the Spymaster."James Jay's invisible ink did not become visible by heating. As he described it, his ink "would elude the generally known means of detection, and yet could be rendered visible by a suitable counterpart." Jay's invisible ink consisted of two chemicals. An agent used one chemical to write an invisible message. To read the message, the reader had to brush a second chemical on the paper; that chemical made the message visible. The two-bottle system, supplied by Jay, gave Washington the secure form of writing that he wanted.Which statement includes explicit information from the excerpt?Washington asked James Jay to invent a form of invisible ink.Washington only knew about invisible ink that required heating.James Jay was a doctor who had knowledge of chemistry.James Jay created an invisible ink system that required two chemicals. Identify concepts and steps of the trial process Describe a congruence transformation. You will need 90 feet of fencing to put all the way around a rectangular garden. The width of the garden is 10 feet. What is the length? 1. The value of (301)^2 (300)^2 is What were the major resources that the Phoenicians exported? ASP ITS DUE TODAY!!!! What formal command would a doctor use with his resident doctor for the verb recetar? What supernatural occurrences does Lennox describe that happened overnight? What might theirsignificance mean?(Act II scenes I-IV) Nora has nn nickels and dd dimes. She has a minimum of $2 worth of coins altogether. Write this situation as an inequality. Todd has been helping his grandmother vanilla ice cream. Yesterday morning they made 4.5 quarts of ice cream. They are going to store the icecream in pint sized containers to place in the freezer.Calculate how many pint-sized containers Todd needs to store 4.5 quarts of ice cream.Todd will needpint-sized containers to store 4.5 quarts of ice cream In plants, water,minerals, and glucosetravel to the parts wherethey are needed through _______. the house was sold. shambhu lived in the house for 10 years. into one sentence with relative clause Uses of lens and mirror in daily life Read the sentence.The animals' habitat was in the direct path of the forest fire.Which type of phrase or clause is underlined in the sentence?