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JEE Main & Advanced Physics NLM, Friction, Circular Motion Sample Paper Topic Test - Newton's Laws Of Motion

  • question_answer
    A man stands on a weighing machine kept inside a lift. Initially the lift is ascending with the acceleration 'a' due to which the reading is W. Now the lift decends with the same acceleration and reading is 10% of initial. Find the acceleration of lift?

    A) \[\frac{g}{19}\,m/{{\sec }^{2}}\]

    B) \[\frac{9g}{11}\,m/{{\sec }^{2}}\]

    C) \[0\,/{{\sec }^{2}}\]

    D) \[g\,m/{{\sec }^{2}}\]

    Correct Answer: B

    Solution :

    [b]
    \[N=m\,(g+a)\]
    \[N'=m\,(g-a)\]
    \[N'=\frac{10}{100}\times N\]
    \[m(g-a)=\frac{m(g+a)}{10}\]
    \[10g-10a=g+a\]
    \[9g=11a\,\,\Rightarrow \,\,a=\frac{9g}{11}\]


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