Question 1002126: A load of 6kg stretches a coil spring to a length of 30cm, and a load of 10kg stretches it to a length of 40cm. Find the length of the spring when there is no load.
Answer by KMST(5328)   (Show Source):
You can put this solution on YOUR website!  = length of the spring when there is no load, in cm.
 = stretching of the spring with a  load, in cm.
 = stretching of the spring with a  load, in cm.
A very high load, will forever deform, or even break a spring.
However, with reasonable loads, the stretching of a spring is proportional to the load applied, applied, and vice versa.
In equation form, that proportional relation is:
Load in kg = K(strecthing in cm) ,
where K is a constant, i kg/cm.
Without writing the units, the data we are given shows
dividing one equation by the other, we get
 ---> 
 --->  --->  .
The length of the spring when there is no load is  .
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