A body of mass m is at rest. Another body of same mass moving with velocity V makes head on elastic collision with the first body. After collision the first body starts to move with velocity

Options

A. v
B. 2v
C. remain at rest
D. not predictable

Answer

A

Explanation

Two bodies of same mass undergoing head on elastic collision, exchange their velocities after collision. So first body starts to move with velocity v and the other body comes to rest.