Sody A in the figure weighs 97 N, and body B weighs 75 N. The coefficients of friction between A and the incline are μ = 0.48 and μ = 0.26. Angle 8 is 33°. Let the positive direction of an x axis be up the incline. What is the acceleration of A if A is initially (a) at rest, (b) moving up the incline, and (c) moving down the incline? Frictionless, massless pulley- A

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”