At the instant shown, an overhead garage door is being shut with point B moving to the lef...

At the instant shown, an overhead garage door is being shut with point B moving to the left within the horizontal part of the door guide at a speed of 5 ft/s, while point A is moving vertically downward. Determine the angular velocity of the door and the velocity of the counterweight C at this instant if L = 6 ft and d = 1.5 ft.

Figure P6.59