A skier coming off the ski lift at the top of the mountain has 221,000 J of potential energy. After skiing for two minutes, the skier has 135,000 J of potential energy left. How much of the skier’s initial potential energy was converted to other forms of energy?

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?