1. The problem statement, all variables and given/known data You are pulling a 39kg box on a level floor by a rope attached to the box. The rope makes an angle of 21 degrees with the horizontal. The coefficient of kinetic frictions between the box and the floor is 0.23. Calculate the magnitude of the tension in the rope needed to keep the box moving at a constant velocity? 2. Relevant equations fnet=ma 3. The attempt at a solution I have pictures of my attempted solution attached. I stopped solving it because I realized that my Ft variables would cancel out and I would have nothing to solve for. Also, what I did makes no sense but I was trying to solve it like you solve other forces problems where you find set up your equations and find a variable present in each equation and set those equations equal to each other. I don't think that works here. My steps are numbered. The attached picture is the first one and the picture at the top is the second one.