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The figure shows a cord attached to a cart with mass = 1.2 kg that can slide along a horizontal rail aligned along an x axis with μk = 0.10. The left end of the cord is pulled over a pulley, of negligible mass and friction and at cord height h = 1.4 m, so the cart slides from x1 = 4.0 m to x2 = 1.0 m. During the move, the tension in the cord is a constant 27 N. What is the change in the kinetic energy of the cart during the move?

The figure shows a cord attached to a cart with mass = 1.2 kg that can slide along a horizontal rail aligned along an x axis with μk = 0.10. The left end of the cord is pulled over a pulley, of negligible mass and friction and at cord height h = 1.4 m, so the cart slides from x1 = 4.0 m to x2 = 1.0 m. During the move, the tension in the cord is a constant 27 N. What is the change in the kinetic energy of the cart during the move?

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  1. (Extra Credit: 1 5 points) The figure shows a cord attached to a cart with mass = 1.2 k g that can slide along a horizontal rail aligned along an x axis with μ k = 0.10 . The left end of the cord is pulled over a pulley, of negligible mass and friction and at cord height h = 1.4 m , so the cart slides from x 1 = 4.0 m to x 2 = 1.0 m . During the move, the tension in the cord is a constant 27 N . What is the change in the kinetic energy of the cart during the move?

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