Two blocks A and B have a weight of 10 lb and 6 lb. respectively. They are resting on the...

Two blocks A and B have a weight of 10 lb and 6 lb. respectively. They are resting on the incline for which the coefficients of static friction are µA = 0.15 and µB = 0.25. Determine the incline angle θ for which both blocks begin to slide. Also find the required stretch or compression in the connecting spring for this to occur. The spring has a stiffness of k = 2 lb/ft.