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The watt or joule per second is the unit of power in SI

The formula is:

1 W= 1 N.m = kg.m2/s2

Substituting the values given:

W=10.12/22

W=10/4=2.5

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Q: A person lifts a 10 kg bucket of water one meter in two seconds - how much power is used by the person's arm?
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