A ball moving with speed u makes an elastic head-on collision with an identical ball at rest. What happens after the collision?
Correct answer B. The first ball stops and the second moves with speed u
Explanation
For equal masses in a 1D elastic collision, v₁ = (m₁ − m₂)u/(m₁ + m₂) = 0 and v₂ = 2m₁u/(m₁ + m₂) = u. The balls exchange velocities.
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