# physics

A spiral spring has a lenght of 14cm when a load of 4N is hung on it.A force of 6N extends the spring by 4cm.calculate the unstretched lenght of the spring.

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1. xi is initial length
x is total length with stretch
x-xi is stretch
F = k(x-xi)
4 = k (14 -xi)
6 = k(4)

k = 6/4 = 3/2
4 = (3/2)(14-xi)
8 = 42 -3xi
3 xi = 34
xi = 11 1/3

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