(Answered) A 0249 kg billiard ball that is moving at 342 ms strikes

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A 0.249 kg billiard ball that is moving at 3.42 m/s strikes the bumper of a pool table and bounces straight back with a speed of 2.58 m/s. How much kinetic energy is lost during the collision? (Assume that the pool table is anchored to the ground so that recoil of the table/earth is negligible)

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