The potential energy of a spring...

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(D) The potential energy $(U)$ stored in a spring is given by the formula $U = \frac{1}{2} k x^2$,where $k$ is the spring constant and $x$ is the disp

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increases whether the spring is stretched or compressed.

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(D) The potential energy $(U)$ stored in a spring is given by the formula $U = \frac{1}{2} k x^2$,where $k$ is the spring constant and $x$ is the displacement from the equilibrium position.Since $x$ is squared in the formula,the potential energy $U$ is always positive for any non-zero displacement $(x 
eq 0)$.Whether the spring is stretched $(x > 0)$ or compressed $(x Therefore,the potential energy of a spring increases whenever it is either stretched or compressed from its natural length.

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