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Physics, 24.12.2019 01:31 edsimms21111

Aforce f at an angle θ above the horizontal is used to pull a heavy suitcase of weight mg a distance d along a level floor at constant velocity. the coefficient of friction between the floor and the suitcase is μ. the work done by the frictional force is ) -fd cos θ (b) - µ fd cos θ (c) -µmgd (d) -µ mgd cos θ

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