A couple is applied at C to the springtoggle mechanism, which is released from rest i...

A couple is applied at C to the springtoggle mechanism, which is released from rest in the position θ = 45°. In this position the spring, which has a stiffness of 140 N/m, is stretched 150 mm. Bar AB has a mass of 3 kg and BC a mass of 6 kg. Calculate the angular velocity ω of BC as it crosses the position θ = 0.Motion is in the vertical plane, and friction is negligible.