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A factory worker moves a 28.0kg crate a distance of 4.80m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.300. A) What magnitude of force must the worker apply? B) How much work is done on the crate by the worker's push? C) How much work is done on the crate by friction? D) How much work is done by the normal force? E) How much work is done by gravity? F) What is the net work done on the crate?

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