If a spring is pulled with 5N force, the total length is 12cm; if it is pulled with 10N force, the total length is 14cm, what is the original length of the spring?

Because the elongation of the spring is directly proportional to the tensile force, when the tensile force increases by 5N, the elongation of the spring increases by 2cm, then the tensile force of the spring under 10N is: 10n5n × 2cm = 4cm, the original length of the spring is: 14cm-4cm = 10cm. So the answer is: the original length of the spring is 10cm

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