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Two identical balls A and B moving with velocities +0.5 m/s and −0.3 m/s respectively, collide head on elastically. The velocities of the balls A and B after collision will be, respectively

1. +0.5 m/s and +0.3 m/s
2. −0.3 m/s and −0.5 m/s
3. +0.3 m/s and 0.5 m/s
4. −0.5 m/s and +0.3 m/s

Correct answer: −0.5 m/s and +0.3 m/s

Solution

In an elastic collision between two identical balls, the velocities are exchanged. Thus, ball A will take the velocity of ball B (-0.5 m/s), and ball B will take the velocity of ball A (+0.3 m/s).

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