# Is energy profile of a spring asymmetric with +x and -x?

## Homework Statement

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The problem is with part b(ii). This is an A level question so only elementary concepts are to be used.

## Homework Equations

$$E = \frac{1}{2}kx^2$$

## The Attempt at a Solution

EPE should be max at 0, 0.4, 0.8 since E is a function of $x^2$. However, mark scheme only accepts 0 and 0.8 only. It is my understanding that energy profile of a spring is symmetric under compression and expansion, but if so, why is 0.4 not acceptable?

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