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Question

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

A
v
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B
2v
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C
v/2
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D
Zero
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Solution

The correct option is B 2v
Since collision is elastic e=1
let's say velocity of body be v, and since M>>m, then velocity of M won't change.
e=vVV

1=vVV
v=2V
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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