Werner Heisenberg is riding a bobsled down a hill that is frictionless. He starts at the top of the hill going at 5m/s and halfway down the hill reaches a speed of 20m/s. a) If the combined mass of Werner and the bobsled is 140kg how much kinetic energy does he have at the top of the hill? b) If mechanical energy is conserved what is the height of the hill? (ignore friction) (Draw a Diagram) (2T, 3K, 2A)