J & K CET Engineering J and K - CET Engineering Solved Paper-2014

  • question_answer A constant retarding force of \[80\text{ }N\]is applied to      a body of mass \[50\text{ }kg\]which is moving initially      with a speed of\[20\text{ }m/s\]. What would be the time required by the body to come to rest?              

    A)  \[15\,\,s\]  

    B)  \[14\,\,s\]

    C)  \[12.5\,\,s\]

    D)  \[1\,8\,\,s\]           

    Correct Answer: C

    Solution :

    Here, \[a=\frac{F}{m}=\frac{80}{50}=1.6m/{{s}^{2}}\] \[u=20m/s\] and \[v=0\] From    \[v=u+at\] \[0=20-1.6\times t\] \[t=\frac{20}{16}=12.5\,s\]

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