Weight of the collar, $W = 2.6 \text{ lb}$
Spring constant, $k = 4.7 \text{ lb/ft}$
Unstretched length of the spring, $L_0 = 31 \text{ in} = 31/12 \text{ ft} \approx 2.5833 \text{ ft}$
From the diagram, we can determine the coordinates of points O, A, and B.
Let
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