Body A weighs 104 N, and body B weighs 30 N. The coefficients of friction between A and the incline are ?s = 0.56 and ?k = 0.25. Angle ? is 40°. Let the positive direction of an x axis be up the incline.
(a) Find the acceleration of A if A is initially at rest.
(b) Find the acceleration of A if A is moving up the incline.
(c) Find the acceleration of A if A is moving down the incline.