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

  • question_answer
    A force acts on a body of mass 5 kg and changes its velocity from 8 m/s to 12 m/s in 4 s, then magnitude of force is

    A) 8 N                                          

    B) 4 N

    C) 5 N                                          

    D) 6 N

    Correct Answer: C

    Solution :

    [c] According to Newton's second law of motion,
    Force = Rate of change in momentum
    \[\operatorname{F}=\frac{m(v-u)}{t}=\frac{5(12-8)}{4}=5\operatorname{N}\]


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