The 80-kg man pushes on the 200-kg crate with a horizontal force F with a magnitude equal to 750 N. The coefficients of non-sliding (static) and sliding (kinetic) friction between the crate and the surface are µs = 0.30 and μk = 0.20, respectively. At the instant shown, what is the magnitude of the frictional force acting between the crate and the floor? a. 589 N b. 156.9 N c. 235 N d. 392 N What is the magnitude of the acceleration of the crate? (m/s²) a. 0.807 b. 1.788 c. 5.71 d. 3.75

Q: This second answer is still incorrect.  Would there be another way to figure this out?   Thanks

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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?”