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RELATED PROBLEMS 21. A 38-kg crate rests on a horizontal floor. A horizontal pulling force of 170 N is needed to start the crate moving.

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RELATED PROBLEMS 21. A 38-kg crate rests on a horizontal floor. A horizontal pulling force of 170 N is needed to start the crate moving. After it is in motion, a horizontal pulling force of 120 N is needed to slide the crate across the floor at constant speed. 38 kg a) Find the coefficient of static friction between the crate and the floor. b) Find the coefficient of kinetic friction between the crate and the floor

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