解答
Force $F = -kx$; Potential energy $E_p = \frac{1}{2}kx^2$, where $k$ is the spring constant and $x$ is displacement from equilibrium.
解説
The negative sign signifies that the spring exerts a restoring force directed opposite to displacement.
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What is Hooke's Law for an ideal spring, and what is its stored elastic potential energy?
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