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  5. Time and Motion

9th Class Science Time and Motion Question Bank MCQs - Motion

  • question_answer
    The acceleration of a car that speeds up from 12 m/s to 30 m/s in 15 s, is

    A) \[2.4\text{ }m/{{s}^{2}}\]          

    B) \[1.2\text{ }m/{{s}^{2}}\]

    C) \[2\text{ }m/{{s}^{2}}\]             

    D) \[5.2\text{ }m/{{s}^{2}}\]

    Correct Answer: B

    Solution :

    [b] \[a=\frac{dv}{dt}\]
    The increase in speed = (30 -12) =18 m/s
    Then, \[a=\frac{18}{15}=1.2\operatorname{m}/{{s}^{2}}\]


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