The total length of a spring when a mass of \(20 \mathrm{~g}\) is hung from its end is \(14 \mathrm{~cm}\), while its total length is \(16 \mathrm{~cm}\) when a mass of \(30 \mathrm{~g}\) is hung from the same end. Calculate the unstretched length of the spring assuming Hooke's law is obeyed.

A. \(9.33 \mathrm{~cm}\)
B. \(12.00 \mathrm{~cm}\)
C \(10.00 \mathrm{~cm}\)
C. \(10.66 \mathrm{~cm}\)  

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Correct Answer: C