A body of mass 'm' collides against a wall with a velocity 'v&apo

Question

A body of mass 'm' collides against a wall with a velocity 'v' and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)

Options:

A . Zero

B . 2 mv

C . mv

D . - 2 mv

Answer: Option D
:
D
Change in momentum =

m {\to v}_{2} - m {\to v}_{1} = - m v - m v = - 2 m v

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