1. There's no kinetic energy and no elastic potential energy. 2. All the energy is now in elastic potential energy. 3. Elastic potential energy is the potential energy of an stressed in formal terminology ).4. Elastic potential energy is defined as a work needed to compress or extend a spring.5. Heat, sound, gravitational potential, elastic potential . . . the list goes on. 6. I know the equation, but the only thing missing is the actual elastic potential energy. 7. The equation with an elastic potential can be solved, in a straightforward manner, by substitution. 8. This is partly achieved through the elasticity of the tongue and the conversion of elastic potential energy into kinetic energy. 9. Earthquakes also release stored elastic potential energy in rocks, a store that has been produced ultimately from the same radioactive heat sources. 10. Therefore the change in elastic potential energy in the spring, found by " U s = 0.5kx 2 ".