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9th Class Science Time and Motion Question Bank Motion

  • question_answer
    A car covers the first half of the distance between two places at a speed of \[40\,\,km\,\,{{h}^{-1}}\] and the second half at\[60\,\,km\,\,{{h}^{-1}}\]. Find the average speed of the car.

    A) \[100\,\,km\,\,{{h}^{-1}}\]       

    B)        \[50\,\,km\,\,{{h}^{-1}}\]

    C) \[48\,\,km\,\,{{h}^{-1}}\]           

    D)        \[52\,\,km\,\,{{h}^{-1}}\]

    Correct Answer: C

    Solution :

    \[{{V}_{avg}}=\frac{2\times u\times v}{u+v}=\frac{2\times 40\times 60}{(40+60)}=48\,\,km\,\,{{h}^{-1}}\]


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