Question to test the quality of a tennis ball you drop it, Ask an Expert

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Question: To test the quality of a tennis ball, you drop it onto the floor from a height of 4.66 m. It rebounds to a height of 2.03 m. If the ball is in contact with the floor for 14.5 ms,

Part A: What is its average acceleration during that contact?

Please show work I think I have the answer just not positive.

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