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  5. Time and Motion

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

  • question_answer
    The position of a particle moving along the X-axis at certain times is given below
    t(s) 0 1 2 3
    x(m) -2 0 6 16
    Which of the following describes the motion correctly?

    A) Uniform, accelerated

    B) Uniform, decelerated

    C) Non-uniform, accelerated

    D) There is not enough data for generalisation.

    Correct Answer: C

    Solution :

    [c] Instantaneous velocity, \[v=\frac{\Delta x}{\Delta t}\]
    By using data from the table,
    \[{{v}_{1}}=\frac{0-(-2)}{1}=2\operatorname{m}/s\]
    \[{{v}_{2}}=\frac{6-0}{1}=6\operatorname{m}/s\]
    \[{{v}_{3}}=\frac{16-6}{1}=10\operatorname{m}/s\]
    Thus, the motion described is non-uniform and accelerated.


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