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

  • question_answer
    A force of \[200\,\,N\] acts on a body of mass \[2\,\,kg\] for\[10\,\,s\]. Find the change in the momentum of the body.

    A) \[1000\,\,N\,\,s\] 

    B)        \[250\,\,N\,\,s\]

    C) \[500\,\,N\,\,s\]  

    D)        \[2000\,\,N\,\,s\]  

    Correct Answer: D

    Solution :

     \[F=\frac{m(v-u)}{t},\,\,200=\frac{2(v-u)}{10}\]\[\Rightarrow \]\[(v-u)=1000\,\,m\,\,{{s}^{-1}}\]Change in momentum\[=m(v-u)\]\[=2\times (1000)=2000\,\,N\,\,s\]


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