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Question: a child bounces a 45 g superball on the sidewalk...

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A child bounces a 45 g superball on the sidewalk. The velocity change of the superball is from 27 m/s downward to 16 m/s upward. If the contact time with the sidewalk is 1/800 s, what is the magnitude of the average force exerted on the superball by the sidewalk? Answer in units of N.

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