Two small 6-kg masses are joined by a string, which can be assumed to be massless. The string has a tangle in it, as shown in the figure. With the string tangled, the masses are separated by 3 m. The two masses are then made to rotate about their center of mass on a frictionless table at a rate of 9 rad/s. As they are rotating, the string untangles and lengthens to 3.8 m. What is the angular velocity of the masses after the string untangles?