the rider is 85.0 kg. Choose a suitable system. Find the initial kinetic energy of the

system. The rider coasts up the hill. Assuming there is no friction, at what height will

the bike come to rest?

16. Suppose that the bike rider in problem 15 pedaled up the hill and never came to a stop.In what system is energy conserved? From what form of energy did the bike gain

mechanical energy?

17. A skier starts from rest at the top of a 45.0-m-high hill, skis down a 30° incline into a valley, and continues up a 40.0-m-high hill. The heights of both hills are measured from

the valley floor. Assume that you can neglect friction and the effect of the ski poles. How fast is the skier moving at the bottom of the valley? What is the skier’s speed at the top of the next hill? Do the angles of the hills affect your answers?

0