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7th Class Science Time and Motion Question Bank Motion and Time

  • question_answer
            The speed of a train is \[20\,m\,{{s}^{-1}}.\]What is the speed in km\[km\,{{h}^{-1}}?\]

    A) \[60\text{ }km\text{ }{{h}^{-1}}\]            

    B) \[40\text{ }km\text{ }{{h}^{-1}}\]            

    C)        \[~72\text{ }km\text{ }{{h}^{-1}}\]     

    D)        \[20\text{ }km\text{ }{{h}^{-1}}\]                            

    Correct Answer: C

    Solution :

    \[1\,km\,{{h}^{-1}}=\frac{5}{18}m\,{{s}^{-1}}\] \[?=20\,m\,{{s}^{-1}}\] \[\frac{20}{5}\times 18=72\,\,km\,{{h}^{-1}}\]


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