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JEE Main & Advanced JEE Main Paper (Held On 15 April 2018) Slot-II

  • question_answer
    A body of mass \[2kg\] slides down with an acceleration of \[3m/{{s}^{2}}\] on a rough inclined plane having a slope of \[30{}^\circ \]. The external force required to take the same body up the plane with the same acceleration will be:\[(g=10m/{{s}^{2}})\]                                                                              [JEE Online 15-04-2018 (II)]

    A) \[4N\]                                  

    B) \[14N\]

    C)          \[6N\]                  

    D)          \[20N\]

    Correct Answer: D

    Solution :

    Equation of motion when the mass slides down \[Mg\sin \Theta -f=Ma\] \[10-f=6\] \[f=4N\] Equation of motion when the block is pushed up Let the external force be\[F\] \[F-Mg\sin \Theta -f=Ma\] \[F-10-4=6\] \[F=20N\]


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