1. The problem statement, all variables and given/known data Doug pushes a 5.30 kg crate up a 2.20-m-high 20 degrees frictionless slope by pushing it with a constant horizontal force of 27.0 N. What is the speed of the crate as it reaches the top of the slope? a) Solve this problem using work and energy. 2. Relevant equations Wd=delta KE, ke=.5mv^2 and pe=mgh 3. The attempt at a solution Conservation of energy W.d=Pe+KE Fcos20=mg(h/sin20)+.5mv^2 v= 3.9m/s but I consider another way about the work done work done = delta KE work done on force = Fcos20 work done against the gravitational force = mg(h/sin20) so Work done by force - work done against the gravitational force =Change of KE . which one is a corrected concept or both make sense. thanks so much.