NEET Sample Paper NEET Sample Test Paper-15

  • question_answer The potential energy of a certain spring when stretched through a distance S is 10 joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance S will be

    A)  30                 

    B)  40

    C)  10                 

    D)  20

    Correct Answer: A

    Solution :

    As given in the problem,\[\frac{1}{2}k{{s}^{2}}=10\,J\] \[\therefore \]\[\frac{1}{2}k\left[ {{(25)}^{2}}-{{(s)}^{2}} \right]=3\times \frac{1}{2}k{{s}^{2}}=3\times 10=30\,J.\] Hence, the correction option is [a].

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