A spring supporting a mass of 30 kg compresses 0.6 m. How far does the spring compress when it supports a mass of 10 kg?

For the same spring, compression is proportional to the supported mass. Since 10 kg is one-third of 30 kg, the compression is 0.6 m ÷ 3 = 0.2 m, so the correct choice is B) 0.2 m.

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