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

  • question_answer
    A force acts on a body of mass \[3\,\,kg\] such that its velocity changes from \[4\,\,m\,\,{{s}^{-1}}\] to \[10\,\,m\,\,{{s}^{-1}}\].Calculate the change in the momentum of the body.

    A) \[2\,\,kg\,\,m\,\,{{s}^{-1}}\]      

    B)        \[14\,\,kg\,\,m\,\,{{s}^{-1}}\]

    C) \[18\,\,kg\,m\,\,{{s}^{-1}}\]        

    D)        \[42\,\,kg\,\,m\,\,{{s}^{-1}}\]

    Correct Answer: C

    Solution :

     Change in the momentum\[=m(v-u)=3(10-4)=18\,\,kg\,\,m\,\,{{s}^{-1}}\]


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