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Question

In the figure a smooth pulley of negligible weight is suspended by a spring balance. Weights of 1 kg and 5 kg are attached to the opposite ends of a string passing over the pulley and move with acceleration because of gravity. During the motion, the spring balance reads a weight of

A
6 kg
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B
Less than 6 kg
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C
More than 6 kg
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D
May be more or less than 6 kg
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Solution

The correct option is B Less than 6 kg
Reading of spring balance is
Reading =Thrustg=4m1m2m1+m2=103 kg
Reading =3.33 kg (<6 kg)
Hence, the correct answer is (b).

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