1. The problem statement, all variables and given/known data A 3.0 kg body is at rest on a frictionless horizontal air track when a constant horizontal force acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in Figure 7-26. The force is applied to the body at t = 0, and the graph records the position of the body at 0.50 s intervals. How much work is done on the body by the applied force between t = 0 and t = 2.0 s? http://www.lowellphysics.org/beta/Textbook%20Resources/Chapter%207.%20Kinetic%20Energy%20and%20Work/Problems/c07x7_11.xform_files/nw0308-n.gif 2. Relevant equations um... v = x/t, a = v/t, F = ma, W = Fd? 3. The attempt at a solution delta v = x/t = 0.8/2 = 0.4 m/s delta a = v/t = 0.4/2 = 0.2 m/s^2 F = ma = 3*0.2 = 0.6 N W = Fd = 0.6*0.8 = 0.48 J This is not the correct answer. The correct answer is 0.96 J, twice my answer. What am I doing wrong? Please help me. This is not an assigned problem for points; it's just to help me understand.