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A ball of mass 0.4 kg is lifted up to a height of 10 m. what...

A ball of mass 0.4 kg is lifted up to a height of 10 m. what is the ball's potential energy at this point? if the ball is dropped from the rest at this height, what is the ball's speed just before it hits the ground. if the force of air resistance is 0.1 N, what is the ball's speed just before it hits the ground?

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