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You are lowering two boxes, one on top of the other, down the ramp shown in the figure (Figure 1) by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of $12.0cm/s$. The coefficient of kinetic friction between the ramp and the lower box is 0.476 , and the coefficient of static friction between the two boxes is 0.823 . You may want to review (Page) For help with math skills, you may want to review: Resolving Vector Components Calculating Trigonometric Function Values For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Toboggan ride with friction II.
What is the magnitude $f$ of the friction force on the upper box? Express your answer in newtons. Part C What lorce $T$ do you need to exert to accomplish this? Express your answer in newtons.