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Physics, 23.05.2021 14:00 needhelpwithHW10

A 0.16 kg billiard ball moving to the right at 1.2 m/s has a head-on elastic collision with another ball of equal mass moving to the left at 0.85 m/s. The first ball moves to the left at 0.85 m/s after the collision. Find the total kinetic energy before and after the collision.

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