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**Linear Thermal expanion! what is the formula we use?**

## Homework Statement

I have been given a linear coefficient which 1.2*10^-5 of something

i have been given the initial temperature of 30 degrees and final temperature of 55 degrees

I have been given that initial length is 3.0 m

I am trying to find the unknown final length ?

## Homework Equations

please what's the relevant equation i need to use