You reach out the second story window which is 5 m above the sidewalk and throw a 0.2 kg ball straight upward with 2 J of kinetic energy. what is the balls gravitational potential energy when it is released? what is the balls gravitational potential energy just before hitting the sidewalk? what is the balls kinetic energy just before hitting the sidewalk? how would the answer to part C change at the ball head initially been thrown straight down with 2 J of kinetic energy
