A child bounces a 45 g superball on the side-walk. the, Ask an Expert

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A child bounces a 45 g superball on the side-walk. The velocity change of the superball is from 23 m/s downward to 14 m/s upward. If the contact time with the sidewalk is 1/800s, what is the magnitude of the average force exerted on the superball by the sidewalk?

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