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Impulsive Forces in Collision

A body of mas...

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)

A

Zero

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B

2Mv

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C

Mv

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D

- 2 Mv

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Solution

The correct option is D
- 2 Mv

Change in momentum = $m {\to v}_{2} - m {\to v}_{1} = - m v - m v = - 2 m v$

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