physics

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a child bounces a superball on the sidewalk. The velocity change of the superball is from 23m/s downward to 14m/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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    List the formulas your teacher has you use, so I can solve it using methods that you are familiar with.

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