I'm having difficulty with this problem. A box weighing 200N is lifted 2.0 meters up a ramp using 350N. 76% of the work moves the box and 24% of the work overcomes the force of friction between the box and the ramp. What is the length of the ramp? Work in the y-axis is conserved = 200N x 2.0 meters = 400 J Work due to friction is not conserved but can be calculated Total Work (x and y) = 400 J / 0.76 = 526.32 J Work due to friction is 126.32 J Length of ramp = 126.32 J / Force of friction Length of ramp = 126.32 J / Uf x 200N x cos(angle between gravity and normal of the ramp) Is this correct? How do I calculate the length of the ramp?