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8b.15 A skier with a mass of 80 kg starts from rest at the top of the slope and skis down from an elevation of

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8b.15 A skier with a mass of 80 kg starts from rest at the top of the slope and skis down from an elevation of 150 m. The slope is 500 m long and the speed of the skier at the bottom of the slope is 20 refs. How large is the frictional force? [Answen 208 N]

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