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A vertical spring has a length of 0.25 m when a 0.275 kg mass hangs from...

A vertical spring has a length of 0.25 m when a 0.275 kg mass hangs from it, and a length of 0.775 m when a 1.8 kg mass hangs from it.

What is the force constant of the spring, in newtons per meter?

What is the unloaded length of the spring, in centimeters?

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