Two blocks A and B are in contact with each other on a table without friction. A horizontal force equal to 3 Newtons is applied to block A (the larger block). a) If M_a =4kg and M_b=1 kg Find the magnitude of the force between the blocks b) If now the force is applied to block B (instead of A), what is the force between the blocks? c) Explain in your own words what happened (the results of (a) and (b)

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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?”