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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2005

  • question_answer
    A sphere is accelerated upwards by a cord whose braking strength is four times its weight. The  maximum acceleration with which the sphere can move up without breaking the cord is:

    A)  g                                            

    B)  3g 

    C)  2g                         

    D)         4g

    Correct Answer: B

    Solution :

    Here the tension in the cord is given by \[T=mg+ma\] (Here: upwards acceleration = a. mass of sphere \[=m,T=4\,ma)\] So,          \[4mg\,=mg+ma\]                                 \[3mg=ma\]                                      \[g=\frac{a}{3}\] or                    \[a=3g\]


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