First slide

Second law

Question

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

Easy

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

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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