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

  • question_answer
    A force produces an acceleration of \[5.0\,\,cm\,\,{{s}^{-2}}\] when it acts on a body of mass\[20\,\,g\]. Find the force acting on the body.

    A) \[1\times {{10}^{-3}}N\]            

    B)        \[2\times {{10}^{-3}}N\]

    C) \[4\times {{10}^{-3}}N\]          

    D)        \[5\times {{10}^{-3}}N\]

    Correct Answer: A

    Solution :

     \[F=ma=20\times 5=100\,\,dynes\] \[\therefore \]\[F=100\times {{10}^{-5}}N=1\times {{10}^{-3}}N\]


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