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9th Class Science Time and Motion Question Bank Motion

  • question_answer
    A particle moves along x-axis in such a way that its coordinate (x) varies with time (t) according to the expression, \[x=(2-5t+6{{t}^{2}})m\]. Then the initial velocity of the particle is

    A)  - 5 m/ sec            

    B)  - 3 m/sec

    C)  6 m/sec          

    D)         3 m/sec

    Correct Answer: A

    Solution :

     Given\[x=2-5t+6{{t}^{2}}\] Comparing it with\[x=ut+\frac{1}{2}a{{t}^{2}}\], we get initial velocity,\[u=\mathbf{-5}\,\,\mathbf{m/s}\]


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