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An elevator has a mass of 1170kg and carries a maximum load of 786 kg. A constant frictionalforce of 4260 N retards its motion upward. The accelerationof gravity is 9.8 m/s2. What power must the motor deliver at a instantaneous speed of 3.36 m/s if the elevator is designed to provide an upward acceleration of 1.08 m/s2?

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