*18-40. At the instant shown, the 50-lb bar rotates clockwise at 2 rad/s. The spring attached to its end always remains vertical due to the roller guide at C. If the spring has an unstretched length of 2 ft and a stiffness of k = 6 lb/ft, determine the angular velocity of the bar the instant it has rotated 30° clockwise. Datum through A. T₁ + V₁ = T2 + V2 A 2 rad/s 6 ft wwwwww 4 ft B