The bob `A` of a simple pendulum is released when the string makes an angle of `45^(@)` with the vertical. It hits another bob `B` of the same material and same mass kept at rest on the table. If the collision is elastic, then

Options

A. Both A and B rise to the same height.
B. Both A and B come to rest at B
C. Both A and B move with the same velocity of A
D. A comes to rest and B moves with the velocity of A

Answer

D

Explanation

Due to the same mass of A and B as well as due to elastic collision, velocities of spheres get interchanged after the collision. So, A comes to rest and B moves with the velocity of A.