[3] (20 points) The springloaded mechanism shown below is initially lying horizontal [t9 2 0). At this position, the spring (k : 4flUNlm) is compressed by 5 where (b : 0.3 m). Once released from this position, it travels in a vertical plane as shown in the gure. Determine the speed of particle B (mu 2 0.8 kg) and the corresponding angular speed 9 of the bar OAB when 9 : 25. Assume that the masses of the connecting bars OAB and AC and roller C are negligible. _vx\\\\\\\\\\\\