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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\[200\,\,g\]. The velocity of the body changes from \[15\,\,m\,\,{{s}^{-1}}\] to \[25\,\,m\,\,{{s}^{-1}}\] in\[2.5\,\,s\]. What is magnitude of the force, assuming the force to be constant?

    A) \[0.4\,\,N\]        

    B)        \[0.5\,\,N\]

    C) \[0.6\,\,N\]        

    D)        \[0.8\,\,N\]  

    Correct Answer: D

    Solution :

     \[F=ma=m\left( \frac{v-u}{t} \right)=0.2\left( \frac{25-15}{2.5} \right)\]\[=0.8\,\,N\]


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