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    I had a question wherein a string with a mass at the end is pulled down and then released. In the second part of the question, I am to find the distance from its fixed end to the particle when it first comes to rest.

    So because it's coming to rest after being released from extension, the string, I guess, has negative extension. Compression.

    However, the answer only deals with kinetic energy and gravitational potential. (KE loss is GPE gain). Why, when the extension of the string is negative, is there no elastic potential energy? Is it just the nature of a string? I'm sure that EPE would be considered in the case of a spring, so I'm assuming that it's due to the nature of a string.

    I'd just like to make sure.

    Sorry if it's a stupid question.

    A string will go slack after reaching its natural length so it will have no energy and will not have any tension. A spring will have tension when it is pushed past its natural length but the tension will push the other way.
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Updated: March 2, 2018

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