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Work = M x g x H => (315-kg) x (9.8m/s^2) x (16m)

Work = 49392 J

Power = 1750W

Time = Work/Power => (49392 J)/(1750W)

Time = 28.2s

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Q: How long will it take a 1750W motor to lift a 315-kg piano to a sixth story window 16m above?
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