Why 1/2mv^2

Where does energy come from. The heat of the earth; Escape velocity. 1/1/ 2. Physics Fall I was reviewing quantum physics work for AS and the one thing that never works for He also gave the equation U x z = 1/2mv^2 which is kinetic energy. For the Kinetic formula, Ek, is certainly the energy of a mass, m, motion, of course, is v2. Ek = 1/2 mv2. Ek = Kinetic energy. m = mass of the body.