There is a spring with a length of 10 cm. After pulling it with a force of 5 N, the length becomes 12 cm. If pulling it with a force of 10 N, what is the length of the spring?

The elongation of spring is directly proportional to the tension it receives. When it receives 5N tension, the length of spring is 12cm. It can be seen that when the tension of spring is 5N, the elongation of spring is 2cm, when the tension of spring is 1n, the elongation of spring is 2cm, 5N = 0.4n/cm, so when the tension is 10N, the elongation of spring is 10N × 0.4n/cm = 4cm; the length of spring is 10cm + 4cm = 14cm. A: if it is pulled with 10N force, the length of spring becomes 14cm

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