For the position shown where = 30, point A on the sliding collar has a constant velocity v = 0.3 m/s with corresponding lengthening

For the position shown where θ = 30°, point A on the sliding collar has a constant velocity v = 0.3 m/s with corresponding lengthening of the hydraulic cylinder AC. For this same position BD is horizontal and DE is vertical. Determine the angular acceleration a_DE of DE at this instant.

D 200 mm B 90 mm E CA 200 mm