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NEET AIPMT SOLVED PAPER SCREENING 2007

  • 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, blocks 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, i,e. force applied = frictional force                 i.e.,        \[\mu mg=ma\]                 \[or\mu mg=m\left( \frac{v}{t} \right)\]                 \[ort=\frac{v}{\mu g}\]


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