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A spring has a length of 0.280 m when a 0.300 kg mass hangs from it,...

A spring has a length of 0.280 m when a 0.300 kg mass hangs from it, and a length of 0.750 m when a 2.40 kg mass hangs from it.

(a) What is the force constant (in N/m) of the spring?

(b) What is the unloaded length (in m) of the spring?

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