2. Questions Bank
  3. 9th Class
  4. Science
  5. Time and Motion

9th Class Science Time and Motion Question Bank Motion IIT JEE Objective Problems

  • question_answer
    A car moving at a speed of 20 m/s undergoes uniform retardation of\[\text{5 m}/{{\text{s}}^{\text{2}}}\]. It stops in a time of

    A)  100s                     

    B)  4s   

    C)  3s                                          

    D)  5s

    Correct Answer: B

    Solution :

    \[u=20m/s,\,\,v=0,\,\,a=-5m/{{s}^{2}},\,\,t=?\] \[t=\frac{V-u}{a}=\frac{0-20}{-5}=4S\]


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