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**1. Calculate the energy stored in the spring when a forceo f 12N is applied (revision**

a graph is given (force extension graph and when the force is 12N, the extension is 80mm)

a graph is given (force extension graph and when the force is 12N, the extension is 80mm)

**2. f=kx**

**3. I do not know how to solve this problem and my exam is tomorrow!**