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A 50-kg block is pulled along a rough level surface at a constant velocity by the force P equal to 180 N. The figure below

A 50-kg block is pulled along a rough level surface at a constant velocity by the force P equal to 180 N. The figure below shows the free-body diagram of this situation. Fy represents the normal force on the block equal and f represents the force of kinetio friction. What ls the coeficient of kinetic fiction

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