Physics help!

15. A bike rider approaches a hill at a speed of 8.5 m/s. The combined mass of the bike and
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?
Asked May 18, 2015
If you told me the equations (as you SHOULD have them as everyone gets given them) then I would be able to fly through them. So sorry, no can do.
Answered May 24, 2015

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.