1. A 10.0-kg block is released from point A as shown. The track is frictionless except for the portion between points B and C, which has a length of d=6.00 m. The block travels down the track, hits a spring of force constant 2,250 N/m, and compresses the spring x-0.300 m from its equilibrium position before coming to rest momentarily. a) Use Conservation of Energy to determine the coefficient of kinetic friction between the block and the rough surface between B and C. Show all your work, do a free body diagram, etc. b) The mass is then shot back out to the left. What is its final position? If it makes it up the incline, how far up does it go. Explain. 3.00 6.00 m

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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?”