Kinetic energy is a form of energy all bodies have when moving. Unless at absolute zero, all particles have kinetic energy. The formula for kinetic energy is . If an object is dropped form a height then, just before it hits the ground, it is said that where the gravitational potential energy at the beginning, , is equal to the kinetic energy just before it hits the surface . This can be used to find the speed of an object or the height from which it was dropped.