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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

  • question_answer
        A scooter of mass 120 kg is moving with a uniform velocity of\[108\text{ }km{{h}^{-1}}\]. The force required to stop the vehicle in 10 s is

    A)  360 N                                   

    B)  720 N

    C)  180 N                                   

    D) \[120\times 10.8\text{ }N\]

    Correct Answer: A

    Solution :

                            \[v=u+at\] \[\therefore \]  \[0=\left( 108\times \frac{5}{18} \right)+a\times 10\] \[\Rightarrow \]               \[0=6\times 5+a\times 10\] \[\Rightarrow \]               \[0=-\frac{30}{10}=-3\,m{{s}^{-2}}\] Hence, force required \[F=ma=120\times 3=360N\]


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