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Physics

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A rubber ball of mass 40g is dropped from a height of 0.8m onto the pavement. It rebounds to a maximum height of 0.45m. The average force of contact between the pavement and the ball is 2.8N. a) Calculate the velocity of the ball just before it hits the ground b) Calculate the velocity of the ball just after hitting the ground c) Calculate the time of contact between the ball and pavement.

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