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

  • question_answer
    A mass of \[2\,\,kg\] at rest travels for \[4\] seconds with an acceleration of\[1.5\,\,m\,\,{{s}^{-2}}\]. Find the gain of the momentum of the body.

    A) \[5\,\,kg\,\,m\,\,{{s}^{-1}}\]      

    B)        \[10\,\,kg\,\,m\,\,{{s}^{-1}}\]

    C) \[12\,\,kg\,\,m\,\,{{s}^{-1}}\]      

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

    Correct Answer: C

    Solution :

    \[m=2kg;\,\,u=0;\,\,t=4\]seconds;\[a=1.5\,\,m\,\,{{s}^{-2}}\] \[v=u+at=0+1.5\times 4=6\,\,m\,\,{{s}^{-1}}\]. Gain in momentum\[=mv-mu\] \[=m(v-u)=2(6-0)=12\,\,kg\,\,m\,\,{{s}^{-1}}\].


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