You are lowering two boxes, one with a mass of 31 kg on top of the other with a mass of 79 kg, down a ramp. You pull a rope on a surface, pulling parallel to the surface to make it move. Both boxes move together at a constant speed of 16.0 cm/s. The coefficient of kinetic friction between the ramp and the bottom box is = 0.45. The coefficient of static friction between the two boxes is = 0.811. The incline has a rise of 5.0 m over a run of 9.5 m. a) What is the tension in the rope used to lower the boxes? b) What are the magnitude and direction of the frictional force acting on the top box? 3 T = 73.7N 6 fs = 141.8N up incline You are lowering two boxes, one with a mass of 31 kg on top of the other with a mass of 79 kg, down a ramp. You pull a rope on a surface, pulling parallel to the surface to make it move. Both boxes move together at a constant speed of 16.0 cm/s. The coefficient of kinetic friction between the ramp and the bottom box is = 0.45. The coefficient of static friction between the two boxes is = 0.811. The incline has a rise of 5.0 m over a run of 9.5 m. a) What is the tension in the rope used to lower the boxes? b) What are the magnitude and direction of the frictional force acting on the top box? 3 T = 73.7N 6 fs = 141.8N up incline