In an equation of elastic colistion, let's say there are two balls. Ball (A) is colliding into Ball (B) (Ball B is at rest). If Ball (A) Colides with Ball (B) and Ball (A) rebounds with it's original speed, how do I calculate/ what formula can I use to calculate the weight of Ball (B)? Also, what is a better defenition for Rebound in terms of Physics/ collision? (My apologies for the question at the end).

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