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Two equal masses m₁ and m₂ moving along the same straight line with velocities +3 m/s and −5 m/s respectively, collide elastically. Their velocities after the collision will be respectively

1. −3 m/s & +5 m/s
2. +4 m/s for both
3. −4 m/s & +4 m/s
4. −5 m/s & +3 m/s

Correct answer: −3 m/s & +5 m/s

Solution

In an elastic collision between two equal masses, the velocities are exchanged. Hence, m₁ will have the velocity of m₂ (−5 m/s), and m₂ will have the velocity of m₁ (+3 m/s).

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