Question

A perfectly elastic ball $P_1$ of mass m moving with velocity v collides elastically with three exactly similar balls $P_2,P_3,P_4$ lying on a smooth table as shown. Velocities of the four balls after the collision are

• A. v,v,v,v
• B. 0,2v,3v,4v
• C. 0,0,0,v
• D. 0,0,0,0

Answer 1

The correct option is C

0,0,0,v

In elastic collision, when identical bodies collide, exchange of velocities take place.

Hence final answer after all the collision would be 0,0,0,v