Question

A student kicks a ball with a force of 23 N. The ball accelerates in to the right at
14.4 m/s^2. Calculate the mass of the ball.​

Answer 1

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11th

Physics

Laws of Motion

Newton's Second Law of Motion

A ball moving with a speed ...

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Asked on December 26, 2019 by

Rion Attri

A ball moving with a speed of 30 m/s hits the wall and bounces back with same speed. The contact time between the ball and the wall is 0.1 s. Calculate the force exerted by the wall on the ball if mass of the ball is 0.25kg.

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ANSWER

Given : v=30 m/s t=0.1 s m=0.25kg

The ball bounces back with same speed after hitting the wall.

Thus change in its momentum ΔP=mv−(−mv)=2mv=2×0.25×30=15 kg.m/s

Using ΔP=∣F∣t

∴ 15=∣F∣×0.1 ⟹∣F∣=150 N

Thus the force exerted by the wall on the ball F=−150 N