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A water-skier is being pulled by a tow rope attached to a boat. As the driver...

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 61.3-kg water-skier has an initial speed of 5.5 m/s. Later, the speed increases to 11.3 m/s. Determine the work done by the net external force acting on the skier.
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Answer #1

Workdone by the net external force W = ΔKE
                                                            = 0.5m(vf2 -vi2)
                                                            = 0.5 * 61.3 * (127.69 - 30.25)
                                                            = 2986.5 J

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