Question: Collar A can slide on a frictionless vertical rod and is attached as shown to a spring. The constant of the spring is 4 lb/in.,

Collar A can slide on a frictionless vertical rod and is attached as shown to a spring. The constant of the spring is 4 lb/in., and the spring is unstretched when en h = 12 in. Knowing that the system is an equilibrium when h = 16 in., determine the weight of the collar.

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