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A force F is at an angle θ above the horizontal and 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 force F is:A. Fdcos θ - μ mgdB. Fdcos θC. -μ mgdD. 2Fdsin θ - μ mgd
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