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Head-on impact (incomplete data) — two balls have masses in ratio 2:1 and equal-and-opposite momenta before collision (speeds in ratio 1:2 opposite). With coefficient of restitution e (not specified), the velocities of separation are stated to be:

Difficulty: Medium

original velocity in the same direction
half the original velocity in the same direction
half the original velocity in the opposite direction
original velocity in the opposite direction
—

Correct Answer: original velocity in the opposite direction

Explanation:

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