Two blocks A and B weighing 123 and 234 lb, respectively, are released from rest as shown....

Two blocks A and B weighing 123 and 234 lb, respectively, are released from rest as shown. At the moment of release the spring is unstretched. In solving these problems, model A and B as particles, neglect air resistance, and assume that the cord is inextensible.

Figure P4.65

Determine the maximum displacement of block B if α = 20°, the contact between A and the incline is frictionless, and the spring constant is k = 300 lb/ft.