Question: The 50-lb block rests on the rough surface for which the coeffi cient of kinetic friction is k = 0.2. A force F =

The 50-lb block rests on the rough surface for which the coeffi cient of kinetic friction is μ_k = 0.2. A force F = (40 + s²) lb, where s is in ft, acts on the block in the direction shown. If the spring is originally unstretched (s = 0) and the block is at rest, determine the power developed by the force the instant the block has moved s = 1.5 ft. F 30% k = 20 lb/ft wwwww

F 30% k = 20 lb/ft wwwww

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