Hi! How do i find change in kinetic energy? Here is the problem: The rubber ball is dropped 2m elastically off the floor, so its speed immediately after bouncing is the same as immediately b4. If the rubber ball has a mass of 0.015kg and its velocity is 6.26m/s, what is its change in kinetic energy from immediately b4 the collision to immediately after the collision? Breifly justify your answer. Do i use this equation, KE = 1/2mv^2? THANKS!!