\[(a)\;mgh=\frac{1}{2} kx^2 \quad (b)\;mg(h+x)=\frac{1}{2}kx^2 \quad (c)\;mgh=\frac{1}{2}k(x+h)^2 \quad (d)\;mg(h+x)=\frac{1}{2}k(x+h)^2\]

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