The 3-kg sphere is carried by the parallelogram linkage where the spring is unstretched...

The 3-kg sphere is carried by the parallelogram linkage where the spring is unstretched when θ = 90°. If the mechanism is released from rest at θ = 90°, calculate the velocity v of the sphere when the position θ = 135° is passed. The links are in the vertical plane, and their mass is small and may be neglected.