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NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    A block starts moving up a fixed inclined plane of inclination \[60{}^\circ \] with a velocity of 20 m/s and stops after 2 sec. The approximate value of coefficient of friction is - \[\left( g=10\text{ }m/{{s}^{2}} \right)\]

    A) 3

    B)                    3.3

    C)                    0.27

    D)                    0.33

    Correct Answer: C

    Solution :

    Retardation \[=\,\,\,g(sin\,\theta \,\,+\,\,cos\,\theta )\,\,=\,\,5(\sqrt{3}+\mu )\] Now \[v=u-at\] \[\therefore \,\,\,\,\,\,a\,\,=\,\,\frac{u}{t}\,\,\,as\,\,v\,\,=\,\,0\,\,\] \[\therefore \,\,\,\,\text{ }5\left( \sqrt{3}+\mu  \right)=10\,\,\Rightarrow \,\,\mu \,\,=\,\,0.27\]


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