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JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Self Evaluation Test - Laws of Motion

  • question_answer
    A body starts from rest on a long inclined plane of slope\[45{}^\circ \]. The coefficient of friction between the body and the plane varies as\[u=0.3\text{ }x\], where \[x\]is distance travelled down the plane. The body will have maximum speed (For\[g=10\text{ }m/{{s}^{2}}\]) when \[x=\]

    A) 9.8 m    

    B) 27 m

    C) 12 m    

    D) 3.33 m

    Correct Answer: D

    Solution :

    [d] When the body has maximum speed then \[\mu =0.3x=tan45{}^\circ ~~~~\therefore x=3.33\,\,m\]


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