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9th Class Science Force and laws of motion Question Bank Force and Laws of Motion

  • question_answer
    A body of mass 50 kg acquires a speed of 20 m/s under a force of 100 n in time

    A)  5 s                         

    B)         10 s  

    C)  15 s                      

    D)         20 s

    Correct Answer: B

    Solution :

     Change in momentum\[=F\times t\] \[\therefore \]      \[50\times 20=100\times t\]or       \[t=10\,\,\sec \]


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