A ball hits a vertical wall horizontally at 10 ms-1 and bounces back at 10 ms-1 , then

Question

A ball hits a vertical wall horizontally at 10 ms-1 and bounces back at 10 ms-1 , then (A) there is no acceleration because 10 ms-1-10 ms-1=0  (B) there may be an acceleration because its initial direction is horizontal (C) there is an acceleration because there is a momentum change (D) even though there is no change in momentum there is a change in direction. Hence it has an acceleration

Tardigrade Admin · Accepted Answer

As the ball bounces back with same speed so change in momentum =2mv and we know that force = rate of change of momentum ie, force will act on the ball so there is an acceleration.

Q. A ball hits a vertical wall horizontally at $10 m s^{- 1}$ and bounces back at $10 m s^{- 1}$ , then

there is no acceleration because $10 m s^{- 1} - 10 m s^{- 1} = 0$

there may be an acceleration because its initial direction is horizontal

there is an acceleration because there is a momentum change

even though there is no change in momentum there is a change in direction. Hence it has an acceleration

As the ball bounces back with same speed so change in momentum $= 2 m v$ and we know that force = rate of change of momentum ie, force will act on the ball so there is an acceleration.

Q. A ball hits a vertical wall horizontally at 10ms−1 and bounces back at 10ms−1 , then

there is no acceleration because 10ms−1−10ms−1=0