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9th Class Science Force and laws of motion Question Bank Force and Laws of Motion

  • question_answer
    A scooter of mass \[120\,\,kg\] is moving with a uniform velocity of\[108\,\,km\,\,{{h}^{-1}}\]. Calculate the force required to stop the vehicle in\[0.1\,\,s\].

    A) \[26000\,\,N\]    

    B)        \[36000\,\,N\]  

    C) \[46000\,\,N\]    

    D)        \[56000\,\,N\]

    Correct Answer: B

    Solution :

     \[u=108\times \frac{5}{18}=30\,\,m{{s}^{-1}}\]     \[F=\frac{m(v-u)}{t}=120\frac{(0-30)}{0.1}=36000\,\,N\]


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