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11. A roller-coaster car has a potential energy of 450,000] and a kinetic energy of 120,000] at point A in its travel. At the low

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11. \"A roller-coaster car has a potential energy of 450,000] and a kinetic energy of 120,000] at point A in its travel. At the low pint of the ride, the potential energy is zero, and 50,000] of work have been done against friction since it left point A. What is the kinetic energy of the roller coaster at this low point

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