Aball is thrown upward from the ground with an initial speed of 22.0 m/s; at the same instant, another ball is dropped from a building 16 m high. after how long will the balls be at the same height

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.