A boy of mass m = 36 kg is standing initially at rest relative to the moving walkway, which has a constant horizontal speedu = 1.0 m/s. He decides to accelerate his progress and starts to walk from point A with a steadily increasing speed and reaches point B (a distance s = 23 m) with a speed dx/dt = v = 3.3 m/s relative to the walkway. During his acceleration he generates an average horizontal force F between his shoes and the walkway. Calculate the work done on the boy by the force F from an absolute viewpoint and then from a relative viewpoint. Explain the difference. Answers: Absolute viewpoint, Work = Relative viewpoint, Work =

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