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A ball hits a vertical wall horizontally at 10 m/s bounces back at 10 m/s

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a
There is no acceleration because 10 ms− 10ms=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

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detailed solution

Correct option is C

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

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