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A 75.0 kg couch is resting on the floor. The friction coefficient between the couch and the floor is μk = 0.300 for kinetic friction and μs = 0.450 for static friction, respectively. A) If the couch is pushed horizontally with a force of 250 N, what is its acceleration? B) If the couch is pushed by a force of 400 N horizontally, what is its acceleration? C) If the couch is moved 15.0 m across the floor, what is the work done by the friction?
Sagot :
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