End A of the link has a downward velocity vA of 2 m/s during an interval of its motion....

End A of the link has a downward velocity v_A of 2 m/s during an interval of its motion. For the position where determine the angular velocity of AB and the velocity v_G of the midpoint G of the link. Solve the relative-velocity equations, first, using the geometry of the vector polygon and, second, using vector algebra.