For each of the following collisions, state whether it is elastic or inelastic. (a) A ball is dropped from rest and hits the ground. It rebounds to half of its original height. (b) After a ball with 200 J of kinetic energy hits a stationary ball on a horizontal surface, the first ball has 125 J of kinetic energy and the second has 75 J of kinetic energy. (c) A dog leaps in the air and catches a ball in its teeth.

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