Q.

A body of mass M moves with velocity v and collides elastically with a another body of mass m (M>>m) at rest then the velocity of body of mass m is

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a

v

b

2v

c

v/2

d

Zero

answer is B.

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Detailed Solution

When target is very light and at rest then after head on elastic collision it moves with double speed of projectile i.e., the velocity of body of mass m will be 2v.
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