Body A in Fig. 6-36 weighs 96 N, and body B weighs 72 N. The coefficients of friction between A and the incline are μs = 0.40 and μk = 0.25. Angle θ is 40°. Let the positive direction of an x axis be down the slope. What is the acceleration of A if A is initially (a) at rest, (b) moving up the incline, and (c) moving down the incline?
all i know is that (a) must be zero because its at rest. but im not sure about (b) and (c). i tried switching the signs of Fk but it wasnt right
all i know is that (a) must be zero because its at rest. but im not sure about (b) and (c). i tried switching the signs of Fk but it wasnt right