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 71.6-kg water-skier has an initial speed of 5.8 m/s. Later, the speed increases to 11.8 m/s. Determine the work done by the net external force acting on the skier.

Answer 1

the work done is the change in kinetic energy.

W = (1/2)(71.6)(11.8^2 - 5.8^2)