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A mass of 2 kg is suspended with thread ...

A mass of 2 kg is suspended with thread AB. Thread CD of the same type is attached to the other end of 2 kg mass. (i) Lower end of the lower thread is pulled gradually, hander and hander is the downward direction so as to apply force on AB. Which of the thread will break & why? (ii) If the lower thread is pulled with a jerk, what happens?

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(i) Thread AB breaks down. (ii) CD will break.
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