Question

A body of mass 2 kg is moving with the velocity 20 m/s and elastic collision with another mody
of mass 2 kg is at rest. The difference in final velocities of two bodies
1) 20 m/s
2) 10 m/s
3) 5 m/s
4)
zero​

Answer 1

Explanation:

By conservation of linear momentum

2v0=2(4v0)+mv⇒2v0=2v0+mv⇒23v0=mv....(1)

since collision is elastic

vseparation=vapprach⇒v−4v0=v0⇒45v0=v....(2)

equating (2) and (1)

43v0=m(45v0)⇒m=56=1.2kg

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