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A cord is attached to a cart that can slide along a frictionless horizontal rail aligned along an x-axis. The left end of the cord is pulled over a pulley, a negligible mass and friction and at cord height h [m], so the car slides from x1 to x2. During the move, the tension in the cord is a constant T[N]. (a) what is the change in the kinetic energy of the cart during the move?

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