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  3. 9th Class
  4. Science
  5. Time and Motion

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

  • question_answer
    A car retards uniformly at the rate of \[5 m/{{s}^{2}}\] and stops in 10 s. The initial velocity of car is

    A) 10 m/s              

    B) 5 m/s

    C) 50 m/s             

    D) 25 m/s

    Correct Answer: C

    Solution :

    [c] Given, velocity, v = 0, acceleration, a =-5\[\operatorname{m}/{{s}^{2}}\]
    From equation of motion, v = u + at
    \[\Rightarrow \]u=- at = - (-5) \[\times \] 10 = 50 m/s
     


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