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A helical spring of spring constant 270 Nm-1 hangs vertically from a fixed support. When a 1.

A helical spring of spring constant 270 Nm-1 hangs vertically from a fixed support. When a 1.2 kg mass is attached to the free end of the spring the length of the spring is 30cm. What is the unstretched length of the spring? What would be the length of the spring if an additional 0.8 kg was added?

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