JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Sample Paper Topic Test - Work Energy Power

  • question_answer
    A body of mass m dropped from a certain height strikes a light vertical fixed spring of stiffness k. The height of its fall before touching the spring if the maximum compression of the spring is equal to \[\frac{3mg}{k}\] is:

    A) \[\frac{KQ}{R}\]

    B) \[\frac{KQ}{\ell }\]

    C) \[\frac{KQ}{\sqrt{{{R}^{2}}+{{\ell }^{2}}}}\]

    D) \[\frac{mg}{4K}\]

    Correct Answer: A

    Solution :

    [a] \[mg\left( h+\frac{3mg}{K} \right)=\frac{1}{2}K{{\left( \frac{3mg}{K} \right)}^{2}}\]

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