When you apply a force to an object, then it will stretch or change shape.
Any object that can return to its original shape after being stretched is called an elastic object.
In order for an object to change shape, work has to be done.
The energy from the work done is stored by the object as elastic potential energy.
This energy is then converted into kinetic energy after the force is remover from the object, and the object returns to its original shape. e.g. when a spring bounces back into its original form after being stretched.
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