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13. A 70-kg base runner begins his slide into second base when he is moving at a speed of 4.0 m/s. The coeffi- cient

13. A 70-kg base runner begins his slide into second base when he is moving at a speed of 4.0 m/s. The coeffi- cient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to friction acting on the runner? (b) How far does he slide?

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