*13-84. The 5-lb collar slides on the smooth rod. so that
Chapter 13, Problem 13-84(choose chapter or problem)
The 5-lb collar slides on the smooth rod, so that when it is at A it has a speed of \(10 \mathrm{ft} / \mathrm{s}\). If the spring to which it is attached has an unstretched length of \(3 \mathrm{ft}\) and a stiffness of \(k=10 \mathrm{lb} / \mathrm{ft}\),determine the normal force on the collar and the magnitude of the acceleration of the collar at this instant.
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