A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is (a) Both the scales read M kg each (b) The scale of the lower one reads M kg and of the upper one zero (c) The reading of the two scales can be anything but the sum of the reading will be M kg (d) Both the scales read M/2 kg each

Answer: (a). Each balance is light, so the tension is the same throughout. Lower balance holds the block: reads M kg. Upper balance holds the lower balance (massless) plus the block: also reads M kg. So the answer is (a).

A light spring balance hangs from the hook of the other light spring… | JEE Main 2003 (AIEEE)

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Connected Bodies & Pulleys

A light spring balance hangs from the hook of the other light spring balance and a block of mass $M\text{ kg}$ hangs from the former one. Then the true statement about the scale reading is

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Answer: (a)

Each balance is light, so the tension is the same throughout.
Lower balance holds the block: reads $M$ kg. Upper balance holds the lower balance (massless) plus the block: also reads $M$ kg.
So the answer is (a).

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