The four-bar linkage mechanism as shown below has two hydraulic cylinders controlling the motion of the connecting rods A and C so that they can only move in the vertical direction. At this instant, the distance y is 150 mm, so that the distance from A to C is 250mm. A has an upwards velocity of 5.1 m/s and C has an upwards velocity of 3.3 m/s. Calculate the angular velocity of link AB, expressing your answer to one decimal place in units of rad/s, with counter-clockwise rotation as positive. Do not include units in your answer.    

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C 250 mm 200 mm 250 mm C 250 mm 200 mm 250 mm