Two blocks A and B have a weight of 10 and 5 , respectively. They are resting on the incline for which the coefficients of static friction are = 0.15 and = 0.40. The spring has a stiffness of = 7 and is originally unstretched. a) Determine the angle which will cause motion of one of the blocks. b)What is the friction force under block A when this occurs? c)What is the friction force under block B when this occurs?