First slide

Collisions

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)

Moderate

A

Zero
B

2Mv
C

Mv
D

– 2 Mv

Solution

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

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