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A ball of mass 0.40 kg falls vertically, hits the ground with a speed of 19 m/s, then rebounds with a speed of 12.0 m/s.

A ball of mass 0.40 kg falls vertically, hits the ground with a speed of 19 m/s, then rebounds with a speed of 12.0 m/s. If the magnitude of the average force the ground exerted on the ball during the impact was 45 Newtons, how long was the ball in contact with the ground? Please show detailed work, thank you!

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