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An elevator carries a group of people from the ground floor to the third floor of a building. The elevator and passengers have a combined mass of 2600 kg. The height of one floor is 4.5 m. If the elevator moves at a constant speed and goes from the ground floor to the third floor in one minute, calculate the work done on the elevator by gravity, the work done on the elevator by the cable, the kinetic energy of the elevator as it passes the second floor, and final gravitational potential energy of the elevator and passengers. Ignore the brief acceleration when the elevator starts and stops.
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