1. The problem statement, all variables and given/known data http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c07/pict_7_42.gif Figure 7-42 shows a cord attached to a cart that can slide along a frictionless horizontal rail aligned along an x axis. The left end of the cord is pulled over a pulley, of negligible mass and friction and at cord height h = 1.20 m, so the cart slides from x1 = 3.00 m to x2 = 1.00 m. During the move, the tension in the cord is a constant 25.0 N. What is the change in the kinetic energy of the cart during the move? 2. Relevant equations W = F*d cosθ 3. The attempt at a solution Find θ first. θ = tan-1(h / Δx) = tan-1(1.2 / (3-1)) = tan-1(0.6) Sub into work equation. W = F*d*cosθ = (25) * (2) * cos (tan-1(0.6)) = 42.87464629 J The answer should be 41.7 J. Help is much appreciated!