A B Let's revisit a previous problem and add the force of friction. In the figure, block A has a mass of 2.58 kg. It rests on a smooth but not frictionless horizontal table and is connected by a very light horizontal string over an ideal pulley to block B, which has a mass of 2.63 kg. The coefficient of kinetic friction between block A and the table is 0.126. When block B is gently released from rest, how long does it take block B to travel 0.539 cm? Report your answer in seconds.

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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?”