If a block is sliding at constant speed across a frictionless surface, which of the following can we say is true? Explain why. a. There are no forces acting on the block in the vertical direction. b.The net for on the block is zero. c. There are no forces acting on the block in the horizontal direction. d. The block has a positive acceleration.

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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?”