You are lowering two boxes, one on top of the other, down the ramp as shown in the figure by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 15.0 cm/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 magnitud of the friction force on the upper box? 2.50m 32.0 KE 48.0 4.75 m

You are lowering two boxes, one on top of the other, down the ramp as shown in the figure by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 15.0 cm/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 magnitud of the friction force on the upper box? 2.50m 32.0 KE 48.0 4.75 m