(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A series of masses are hung from a vertical spring and the length is measured in each case to the nearest milimeter. Data below:

Mass : Spring Length

050g : 40.2cm

100g : 45.8cm

150g : 50.9cm

200g : 56.4cm

250g : 61.4cm

300g : 66.9cm

350g : 73.7cm

400g : 81.2cm

I need to find the spring constant.

2. Relevant equations

F_{s}= k | l - l_{0}| ,

where

F_{s}= Spring Force

k = spring constant

l = length of spring

l_{0}= initial length of spring

3. The attempt at a solution

I know that F_{s}= F_{g}= mass / 100 (using g = 10 N/kg).

I just don't know how to get the constant because I don't know what the initial spring length is (it's not 0).

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# Need to find the spring constant

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