Question

You are lowering two boxes, one on top of the other, down a ramp by pulling on a rope parallel to the surface of the ramp. Both blocks move with constant velocity of 15 m/s. The coefficient of kinetic friction between the ramp and the lower box is 0.444 and the coefficient of static friction between the two boxes is 0.800. What is the magnitude and direction of the frictional force on the upper box? Magnitude of the applied force? What angle will the top block start sliding down the bottom block?
13

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