1.

Awater-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 60.7- kg waterskier has an initial speed of 5.6 rm's. Later, the speed increases to 11.5 mfs. Determine the work done by the net external force acting on the skier. An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.7* 10# kg, and the force causes its speed to change from 6700 to 5800m/s. (a) What is the work done by the force? (b) If the asteroid slows down over a distance of 2 10 m determine the magnitude of the force