A light spring balance hangs from the hook of | vedclass

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(B) Since the spring balances are considered massless,they do not contribute to the weight measured by the system.When a block of mass $M$ is hung fro

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Both the scales read $M \, kg$ each.

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(B) Since the spring balances are considered massless,they do not contribute to the weight measured by the system.When a block of mass $M$ is hung from the lower spring balance,it measures the tension in the spring,which is equal to the weight of the block,$Mg$. Thus,the lower scale reads $M \, kg$.The upper spring balance supports the entire system,including the lower spring balance and the block. Since the lower spring balance is massless,the tension in the upper spring balance is also equal to the weight of the block,$Mg$. Thus,the upper scale also reads $M \, kg$.Therefore,both scales read $M \, kg$ each.

$A$ light spring balance hangs from the hook of another light spring balance,and a block of mass $M \, kg$ hangs from the lower one. Which of the following statements is true regarding the scale readings?

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