JEE Main & Advanced Physics NLM, Friction, Circular Motion JEE PYQ - NLM Friction Circular Motion

  • question_answer
    A body stars from rest on a long inclined plane of slope \[{{45}^{o}}\]. The coefficient of friction between the body and the plane varies as \[\mu =0.3\,x,\] where \[x\] is distance travelled down the down the plane. The body will have maximum speed (for g=10 m/\[{{\text{s}}^{\text{2}}}\]) when \[x\]= : [JEE ONLINE 22-04-2013]

    A)             9.8 m

    B) 27 m

    C)             12 m    

    D) 3.33 ms

    Correct Answer: D

    Solution :

    [d] When the body has maximum speed then
    \[\mu =0.3x=\tan {{45}^{0}}\]
    \[\therefore \,\,x=3.33\,m\]

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