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A 20 g bouncy ball is dropped from a height of 1.8 m . It rebounds from the ground with 80% of the speed it

A 20 g "bouncy ball" is dropped from a height of 1.8 m. It rebounds from the ground with 80% of the speed it had just before it hit the ground. Assume that during the bounce the gound causes a constant force on the ball for 75 ms. What is the force applied to the ball by the ground in N?

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