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4. (9 points) Three professors of mass 85kg each and a dog of mass 15kg are raised by an elevator with the constant speed of

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4. (9 points) Three professors of mass 85kg each and a dog of mass 15kg are raised by an elevator with the constant speed of 2m/s. You can neglect the mass of the elevator. (4a). (5p) Please find the power of the elevator. (4b). ( 4p ) Please find the work done by the elevator to deliver the professors and the dog from the ground floor to the 12th floor if the height of each floor is 3.5m

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