a constant horizontal force is applied toblock A, which pushes against block B with a 20.0 N force directedhorizontally to the right. the same force is appliedto block B; now block A pushes on block B with a 10.0 N forcedirected horizontally to the left.The blocks have a combined massof 12.0 kg. What are the magnitudes of (a) their acceleration inand (b) force F ?

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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?”