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A 20.0 kg sled is being pulled across a horizontal surface at constant velocity. The pulling force has a magnitude of 80.0N and is directed at an angle of 30.0º above the horizontal. Determine the coefficient of kinetic friction.

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  1. 4 June, 20:30
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    U = F/R = 80/200cos30

    u = 80/100√3

    u = 0.46
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