what is potenial energy ?
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https://www.meritnation.com/ask-answer/question/the-potential-energy-of-a-body-is-defined-as-the-energ/work-and-energy/6962485
https://www.meritnation.com/ask-answer/question/the-potential-energy-of-a-body-is-defined-as-the-energ/work-and-energy/6962485