The small cart is released from rest in position 1 and requires 0.638 seconds to reach position

Question:

The small cart is released from rest in position 1 and requires 0.638 seconds to reach position 2 at the bottom of the path, where its center G has a velocity of 14.20 ft/sec. Determine the angular velocity ω of line AB in position 2 and the average angular velocity ω_av of AB during the interval.