Aboy throws a ball straight up with a speed of 21.5 m/s. the ball has a mass of 0.19 kg. how much gravitational potential energy will the ball have at the top of its flight? (assume there is no air resistance.)

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?