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

  • question_answer
    Two freely hanging weights, each having a mass of 60 gm, are connected by a light thread which passes over a fixed pulley. The mass of the pulley and frictional losses are negligible. If a 10 gm weight is now added to one of the weights, its downward acceleration, in\[\text{cm}/\text{se}{{\text{c}}^{\text{2}}}\], will be approximately

    A)  32                         

    B)         80  

    C)  106                       

    D)         980

    Correct Answer: B

    Solution :

                \[a=\frac{{{m}_{1}}-{{m}_{2}}}{{{m}_{1}}+{{m}_{2}}}=\frac{10}{130}\times 1000=80\]


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