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A 0.20-kg rubber ball, initially at rest, is dropped from the window of a building. It strikes the sidewalk with a speed of 25

 

A 0.20-kg rubber ball, initially at rest, is dropped from the window of a building. It strikes the sidewalk with a speed of 25 m/s and rebounds with a speed of 20 m/s. Ignoring any effect due to air resistance, calculate the magnitude and direction of the change in momentum of the ball as a result of its impact with the sidewalk.

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