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  5. Time and Motion

9th Class Science Time and Motion Question Bank Motion

  • question_answer
    A bus in motion increases its speed from \[30\,\,km\,\,{{h}^{-1}}\] to \[60\,\,km\,\,{{h}^{-1}}\] in \[20\] seconds. Find its acceleration.

    A) \[0.21\,\,m\,\,{{s}^{-2}}\]        

    B)        \[0.42\,\,m\,\,{{s}^{-2}}\]  

    C) \[0.63\,\,m\,\,{{s}^{-2}}\]        

    D)        \[0.84\,\,m\,\,{{s}^{-2}}\]

    Correct Answer: B

    Solution :

    \[a=\frac{60-30}{20}\times \frac{1000}{3600}=0.42\,\,m\,\,{{s}^{-2}}\]


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