A 0.0520 kg golf ball is moving east with a velocity of 2.10 m/s when it collides head on with a stationary 0.155 kg billiard ball. The golf ball rolls directly backward with a velocity of -1.04 m/s. (a) What was the velocity of the billiard ball after the collision? (b) Was the collision elastic? Be sure to prove your answer using energies!
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