Q.

A mass of 1 kg is suspended by a string A. Another string C is connected to its lower end (see figure). If a sudden jerk is given to C, then

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a

The portion AB of the string will break

b

The portion BC of the string will break

c

None of the strings will break

d

The mass will start rotating

answer is B.

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Detailed Solution

When a sudden jerk is given to C, an impulsive tension exceeding the breaking tension develops in C first, which breaks before this impulse can reach A as a wave through block.
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