•7 A 3.0 kg body is at rest on a frictionless horizontal air trackwhen a constant horizontal force F acting in the positive direction ofan x axis along the track is applied to the body. A stroboscopic graphof the position of the body as it slides to the right is shown in Fig. 7-25. The force F is applied to the body at t = 0, and the graph recordsthe position of the body at 0.50 s intervals. How much work is doneon the body by the applied force F between t = 0 and t = 2.0 s?rt= 00.5 s-1.0s-1.5 s2.0 s0.20.40.60.8x (m)

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