A) There is no acceleration because \[10\,\frac{m}{s}-\,10\frac{m}{s}=0\]
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
Correct Answer: C
Solution :
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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