Please help me the options for the question s are the images for image 1 a textbook sits at rest atop a table. What  would it's free body diagram look like for image 2 a stack of text books sit at rest atop a table. What would the fbd of the book on  the very bottom look like?

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Q: 60° 400 N 600 N

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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?”