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Q.

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

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a

6 kg

b

may be more or less than 6kg

c

more than 6 kg

d

less than 6 kg

answer is B.

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Detailed Solution

m₁g -T = m₁a ; T - m₂g = m₂a ;T¹ = 2T

$solving T = \frac{2 m_{1} m_{2} g}{m_{1} + m_{2}} = \frac{2 \times 1 \times 5 \times g}{6}$

$T = \frac{10 g}{6}$

$T' = \frac{20 g}{6}$

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