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A 144 g baseball moving at 28 m/s strikes a stationary 5.25 kg brick resting on...

A 144 g baseball moving at 28 m/s strikes a stationary 5.25 kg brick resting on small rollers so it moves without significant friction. After hitting the brick, the baseball bounces straight back, and the brick moves forward at 1.40 m/s. (a) What is the baseball speed after the collision? (b) Find the total kinetic energy before and after the collision.

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