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## Homework Statement

The graph shows the variation with extension x of the load F on a certain spring

A load of 10 N is placed on the spring. How much additional elastic potential energy will be stored in the spring if it is then extended a further 0.040 m?

a. 0.200 J

b. 0.450 J

c. 0.600 J

d. 0.800 J

## Homework Equations

F = k x

E = 1/2 k x

^{2}

## The Attempt at a Solution

Load of 10 N means the extension is 0.04 m and extended further 0.04 m means that the extension is 0.08 m, right?

I got (c) but the answer key is (a) ??

Thanks