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A 0.30 m long spring with a spring constant of 230 N/m is attached to a...

A 0.30 m long spring with a spring constant of 230 N/m is attached to a 0.60 kg mass and swung around in a circle at a constant speed so that it takes 14.75 s to complete 20 rotations. What would be the length of the spring during the rotations?

The answer is 0.37 m. Please show work.
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