K = (M2-M1)/(d2-d1) = (30-12)/(18-15) = 6 kg/cm .
d = (12kg/6kg) * 1cm = 2 cm.
L + 2 = 15, L = 13 cm.
A load of 12 kg stretches 15 cm and a load of 30 kg stretches 18 cm. Find the natural (unstretched) length of the spring.
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