A 1 kg ball moving at 6 m/s makes a head-on elastic collision with a stationary 2 kg ball. What is the velocity of the 2 kg ball afterwards?
Correct answer C. 4 m/s
Explanation
v₂ = 2m₁u₁/(m₁ + m₂) = (2 × 1 × 6)/3 = 4 m/s. The 1 kg ball rebounds at (m₁ − m₂)u₁/(m₁ + m₂) = −2 m/s.
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