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EAMCET Medical EAMCET Medical Solved Paper-1998

  • question_answer
    A body is projected along a rough horizontal surface with a velocity 6 m/s. If the body comes to rest after travelling a distance 9 m, the coefficient of sliding friction is\[(g=10m{{s}^{-2}})\]:

    A)  0.5                                        

    B)  0.6

    C)  0.4                                        

    D)  0.2

    Correct Answer: B

    Solution :

                     From the relation, \[F=-\mu \,mg\] \[ma=-\mu \,mg\Rightarrow a=-\mu g\]               \[a=-\mu \times 10\]                                     ?(i)                 Given: \[s=9m,\,\mu =6\,m/s\] From the third equation of motion \[{{v}^{2}}-{{u}^{2}}=2as\]                                           ?(ii) Now, putting the given value of s and u in Eq.(ii) \[0-{{(6)}^{2}}=2(-10\mu )\times 9\] \[\mu =\frac{36}{2\times 10\times 9}=0.2\]


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