a 105-kg basketball player crouches down 0.400 m while waiting to jump. after exerting a force on the floor through this 0.400 m, their feet leave the floor and their center of gravity rises 0.950 m above its normal standing erect position. (a) using energy considerations, calculate the player's velocity when they leave the floor. (b) what average force did the player exert on the floor? (do not neglect the force to support their weight as well as that to accelerate them.) (c) what was the player's power output during the acceleration phase?