Una persona lanza verticalmente hacia arriba una piedra la cual regresa en3 segundos al piso (1.5 seg hacia arriba y 1.5 seg hacia abajo). Muestra tu procedimiento.

A) Cuál fue la rapidez inicial de la piedra?

B) Cuál fue la velocidad promedio de la piedra durante todo su recorrido, hacia arriba

y hacia abajo?

C) Cuál fue la rapidez promedio de la piedra en todo su recorrido?

Answers

Answer 1

Responder:

14,7 m / s

7,35 m / s

Explicación:

La velocidad inicial, u

Usando la relación:

v = u + en

a = - 9,8 (aceleración debido a la gravedad) hacia arriba

t = 1,5 segundos (tiempo necesario para alcanzar el máximo. Altura)

v = 0; velocidad final a máxima altura

Por eso,

0 = u - 9,8t

0 = u - 9,8 * 1,5

0 = u - 14,7

u = 14,7 m / s

Velocidad media :

Distancia recorrida / tiempo transcurrido

Distancia viajada :

v² = u² + 2aS

0 = 14,7 ^ 2 + 2 (-9,8) * S

0 = 216,09 - 19,6 S

19,6 S = 216,09

S = 216,09 / 19,6

S = 11,025

Arriba y abajo: 11.025 * 2 = 22.05

Velocidad media en todo:

S t

22.05 / 3

= 7,35 m / s


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