A ball of mass 45kg thrown upward with a velocity of 40m/s 1. calculate the kinetic energy of the ball
2. if the ball reaches the height of 30m find the potential energy exerted​

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.