A 5-kg uniform slender bar (e 0.5 m) is pin-connected to blocks A and B (each with mass 1 kg) at its ends. The system is released from rest in the position and the spring (k-1000 N/m) is horizontal and unstretched. Determine the bar's angular velocity when B has moved 0.2 m downward. The blocks slide in frictionless slots and O is a fixed pin. 

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