Question

Two identical balls A and B having velocities of 0.5 m/s and -0.3 m/s respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be

• A. 0.3 m/s and 0.5 m/s
• B. -0.5 m/s and 0.3 m/s
• C. 0.5 m/s and -0.3 m/s
• D. -0.3 m/s and 0.5 m/s

Answer 1

The correct option is C 0.5 m/s and -0.3 m/s

On elastic collision between two masses moving with finite velocities, their velocities get exchanged and they travel in opposite directions as they were initially.

Hence the velocity of B is $+0.5m/s$ and that of A is $-0.3m/s$