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  5. Time and Motion

9th Class Science Time and Motion Question Bank Motion

  • question_answer
    A race car accelerates uniformly from \[18.5\,\,m\,\,{{s}^{-1}}\] to \[46.1\,\,m\,\,{{s}^{-1}}\] in \[2.47\] seconds. What is the acceleration of the car?

    A) \[11.2\,\,m\,\,{{s}^{-2}}\]          

    B)        \[12.3\,\,m\,\,{{s}^{-2}}\]

    C) \[14.5\,\,m\,\,{{s}^{-2}}\]        

    D)        \[16.7\,\,m\,\,{{s}^{-2}}\]

    Correct Answer: A

    Solution :

    \[a=\frac{v-u}{t}=\frac{46.1-18.5}{2.47}=\frac{27.6}{2.47}=11.2\,\,m\,\,{{s}^{-2}}\]


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