The strain energy $W$ stored in a spring depends on its spring constant $k$ and its extension $x$. This spring follows Hooke’s law, and $W$ is found by using the equation below. $W = \frac{1}{2}kx^2$ The spring constant is $100 \pm 2\,\text{N m}^{-1}$ and the extension is $0.050 \pm 0.002\,\text{m}$. What percentage uncertainty is there in the calculated value of $W$?
- A6%
- B10%
- C16%
- D32%