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A unstretched spring hangs from the ceiling with a length of 0.31 m. A 7.5-kg block is hung from the spring and the spring stretches to be 0.60 m long. How long will the spring be if a 2.9-kg block is hung from the spring? For both cases, all vibrations of the spring are allowed to settle down before any measurements are made. Number 0.31 m 0.60m 2.9 kg 7.5 kg
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