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A body of mass 4 kg moving at 6 m s−1 collides head-on with a stationary body of mass 2 kg and they move off together. Find their common velocity.
Original Khojo Papers practice question — not from a past board paper.
Answer
4 m s−1
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Momentum is conserved: 4 × 6 = (4 + 2)v, so v = 24 ÷ 6 = 4 m s−1. The collision is perfectly inelastic, so kinetic energy is not conserved.
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