Blocks A and B are connected by a cable that passes over a frictionless pulley as shown. If the weight of A is 100 N and the incline plane is smooth, (a) Draw the FBD of each block (b) what should be the mass of B to keep them at rest? (c) Find the magnitude and direction of the force exerted by the incline on the block.

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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?”