Sarah moves her box in 3 minutes and does 14 J of work. John moves his box in the same amount of time using 12 J of work. Who is more powerful?
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Power, like Work, isn't something that is "contained", it is something that is transmitted or delivered. the rate of Work being done is Work/duration. The durations are the same here, so whoever did the most Work delivered the most Power.
i think Sarah, since she moved her box in the same amount of time but did more work