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in Physics by (8.8k points)

A mass of 2kg is suspended with thread AB (Fig. 5.5). Thread CD of the same type is attached to the other end of 2 kg mass. Lower thread is pulled gradually, harder and harder in the downward directon so as to apply force on AB. Which of the threads will break and why?

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AB, because force on the upper thread will be equal to sum of the weight of the body and the applied force.

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