physics
posted by thomas .
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.

physics 
Anonymous
xi is initial length
x is total length with stretch
xxi is stretch
F = k(xxi)
4 = k (14 xi)
6 = k(4)
k = 6/4 = 3/2
4 = (3/2)(14xi)
8 = 42 3xi
3 xi = 34
xi = 11 1/3
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