The collar B of weight W_B is at rest, and when it is in the position shown the spring is unstretched. If another collar A of weight W_A strikes it so that B slides a distance b on the smooth rod before momentarily stopping, determine the velocity of A just after impact, and the average force exerted between A and B during the impact if the impact occurs in time Δt. The coefficient of restitution between A and B is e.

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Units Used: kip = 10 lb Given: WB = 10 lb WA = 1 lb lb ft k = 20 g = 32.2 a = 3 ft b = 4 ft 2 S At = 0.002 s e = 0.5