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

  • question_answer
    Two forces \[{{\operatorname{F}}_{1}}\] and \[{{\operatorname{F}}_{2}}\] are acting on a body as shown in the figure, then acceleration in the body is
     

    A) \[23m/{{s}^{2}}\]           

    B) \[3m/{{s}^{2}}\]

    C) \[2m/{{s}^{2}}\]            

    D) \[22m/{{s}^{2}}\]

    Correct Answer: B

    Solution :

    [b] Resultant force on a body,
    \[F={{F}_{2}}-{{F}_{1}}\]
    = 65 - 50 = 15 N
    By Newton's second law of motion,
    F = ma
    \[\Rightarrow \,\,\,\,15=5a\Rightarrow a=3m/{{s}^{2}}\]


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