A uniform rod (length = 2.4 m) of negligible mass has a 1.8-kg point mass attached to one end and a 2.8kg point mass attached to the other end. The rod is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through a point 1.8 m from the 2.9-kg mass. The rod is released from rest when it is horizontal. What is the angular velocity of the rod at the instant the 2.0kg mass passes through its low point? L}