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JCECE Engineering JCECE Engineering Solved Paper-2008

  • question_answer
    A block \[B\] is pushed' momentarily along a horizontal surface with an initial velocity\[v\]. If \[\mu \] is the coefficient of sliding friction between \[B\] and the surface, block \[B\] will come to rest after a time

    A) \[\frac{v}{g\mu }\]                                         

    B) \[\frac{g\mu }{v}\]

    C)  \[\frac{g}{v}\]                                  

    D)  \[\frac{v}{g}\]

    Correct Answer: A

    Solution :

    Block \[B\] will come to rest, if force applied to it will vanish due to frictional force acting between block \[B\] and surface,\[ie,\]force applied = frictional force \[ie,\]    \[\mu mg=ma\] or            \[\mu mg=m\left( \frac{v}{t} \right)\] or            \[t=\frac{v}{\mu g}\]


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