Final answer:
Elastic potential energy is stored in a mass-spring system when the spring is compressed or stretched. The amount of potential energy depends on the displacement and spring constant.
Step-by-step explanation:
An example of a system where elastic potential energy is stored is a mass-spring system.
In this system, a mass is attached to a spring and when the spring is compressed or stretched, it stores potential energy.
The amount of elastic potential energy stored in the system depends on the displacement of the mass from its equilibrium position and the spring constant.