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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.

0.4 m/s
0.2 m/s
0.1 m/s
0.05 m/s

detailed solution

Correct option is A

In head on elastic collision velocity get interchanged (if masses of particle are equal). i.e. the last ball will move with the velocity of first ball i.e 0.4 m/s

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