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a.) What is the average useful power output (in W) of a person who does6.80106J of useful work in7.60h? b.) Working at this rate, how

a.) What is the average useful power output (in W) of a person who does6.80106J of useful work in7.60h? b.) Working at this rate, how long (in s) will it take this person to lift1900kg of bricks1.40m to a platform? (Work done to lift his body can be omitted because it is not considered useful output here.)

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