Elastic collision conceptual problem

Hello,

My textbook says that if two equal masses, with the second one of them at rest initially, collide in an elastic collision. The first mass will stop and the second one will have the initial speed of the first mass.

WHY? This makes no sense to me. Elastic collision only means momentum + energy is conserved.

Why can’t the first ball rebound?

http://ift.tt/1oCBMut

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