A block of mass 10 kg is suspended through two light spring balances as shown in figure.

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Both the scales will read 10 kg

Both the scales will read 5 kg

The upper scale will read 10 kg and the lower zero

The readings may be anything but their sum will be 10 kg

answer is A.

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Detailed Solution

As the spring balances are light, so tension in both the springs will be same and equal to weight of block suspended.

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