a) Starting from the top at rest, what is the maximum speed you expect at the bottom, assuming an icy surface with virtually no friction? b) You take your sled and go down the hill and your friend measures the speed at the bottom. The slope is full of fresh snow and not very icy, so the speed is less than you expected, only v of 12 m/s. How much kinetic energy is "missing"? h In, CO AS Finally enough snow had fallen to go sledding on your favorite hill. You see on your map the top is at a height h, of 130 m, the bottom is at a height h, of 100 m above sea level and the run of the nice slope, L, is 50 m long. Your mass including the sled, m, is about 70 kg. c) How much work, Wg, did the Earth's gravitation do, and how much work, Wf, did the force of friction do on the sled during the descent? d) Estimate the average force, f, of the snow along the total path that held you back.