Q:
# What is the equation for elastic potential energy?

**According to Physics Classroom, elastic potential energy is a kind of energy kept in elastic materials due to compression or stretching by an external force.** The elastic potential energy formula is P.E = 1/2 kx2.

In the equation above, "P.E" is the elastic potential energy and expressed in joules, "X" is the displacement and "K" is the spring constant.

This equation is derived from Hooke���s Law, which states that force exerted to stretch a spring is directly proportional to its displacement. This is expressed by the formula F= -kx. TutorVista.com states that this energy formula is applied for problems where elasticity, elastic force and displacement are mentioned. In addition, Physics Classroom gives a special equation for springs that shows the amount of elastic potential energy and its relationship with the amount of stretch/compression and the spring constant.

PE(spring) = 0.5*k*x2 In this equation, "K" is spring constant, and "X" is the amount of compression (relative to equilibrium position).

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