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A ball of mass m collides with a second ball in a head on collision. What is the mass of the second ball m2

A ball of mass m collides with a second ball in a head on collision. What is the mass of the second ball m2 if the first ball rebounds with a speed equal to exactly one half of its original speed. Answer in terms of the mass m. Assume the second ball is initially at rest and the collision is elastic.

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