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a tennis ball of mass 0.060 kg is served. It strikes the ground with a velocity of 54m/s ( 120 mi/h) at an angle of 22 degree below the horizontal. Just after the bounce it is moving at 53 m/s at an angle of 18 degree above the horizontal. If the interaction with ground lasts 0.065s, what average force did the ground exert on the ball?

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