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Q. Sally applies a force of 462 N along a rope to drag a wooden crate (m=85.0 kg) across a floor with a constant speed. The rope tied to the crate is pulled at an angle of 56.0°? relative to the ground. The crate is moved 24.5 m; what work is done by the floor through the force of friction between the floor and the crate?

Q. A box with a mass of 6 kg is lifted (without acceleration) through a height of 6.0 m in order to place it upon the shelf of a closet.

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