- #1
Jabababa
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Homework Statement
A 45 kg object is lifted vertically at a constant speed to a height of 9.0m by a 750 W electric motor. If this motor is 25% efficient in converting electric energy to mechanical energy, how long does the motor take to lift the object?
Homework Equations
The Attempt at a Solution
I have no idea how to even start this question. I don't understand why it is in electric circuit unit.