Work Energy And Power Question 109

Question: A ball hits a vertical wall horizontally at 10m/s bounces back at 10 m/s [JIPMER 1999]

Options:

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

Show Answer

Answer:

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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