A door AB weighing 80 lb is pinned at A and swings in the horizontal plane. The spring CD has stiffness k and is unstretched when θ = 0°. Let L = 1.5 ft and h = 0.5 ft.
If the door is released from rest when θ = 45° and k = 50 lb/ft, determine the speed of B when θ = 0.
Figure P8.17
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