The mechanism shown is one of two identical mechanisms attached to the two sides of a 200-lb uniform rectangular door. Edge ABC of the door is guided by wheels of negligible mass that roll in horizontal and vertical tracks. A spring with a constant of k = 40 lb/ft is attached to wheel B. Knowing that the door is released from rest in the position θ = 30° with the spring unstretched, determine the velocity of wheel A just as the door reaches the vertical position.

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A 5 ft Fig. P17.40 and P17.41 0 B www.wo k 5 ft C