streched piece of rubber
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You input potential (stored) energy into the rubber band system when you stretched the rubber band back. Because it is an elastic system, this kind of potential energy is specifically called elastic potential energy.
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When a rubber band is stretched, work is done on it , in course of which some amount of energy in the form of elastic potential energy (strain energy) is input into it. This increases the potential energy of the system. When the rubber band is released, the potential energy is quickly converted to kinetic energy.
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