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3 elastic balls (with masses m1,m2,m3) at rest are lined up along a straight line on...

3 elastic balls (with masses m1,m2,m3) at rest are lined up along a straight line on a smooth plane. At t=0, ball 1 moves along the line at velocity v1. Assume v1,m1 and m3 are given. Find the mass of the second ball (m2) such that the 3rd ball is at max velocity after the collisions.

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