Use the equation elastic potential energy = 0.5 x spring constant x extension squared.

The equation for elastic potential energy, given by Ee = 0.5 x k x e², describes the energy stored in a spring when it is either stretched or compressed. Here, Ee represents the elastic potential energy in joules, k is the spring constant measured in newtons per metre, and e is the extension in metres. This relationship shows that the energy stored increases with the square of the extension, meaning that if the extension is doubled, the elastic potential energy increases by a factor of four. This principle is crucial in understanding how elastic materials behave under stress.