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OpenStudy (anonymous):

The mass of a steel wrecking ball is 1.50 E3 kg. What power is used to raise it to a height of 40.0 m if the work is done in 20.0 seconds?

OpenStudy (ivancsc1996):

So if power is work over time you already have time. You can find the work by multiplying force times height. The force requiered is the weight of the ball which is mg.

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