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23 March, 13:01

A 50.0 kg woman climbs a flight of stairs 6.00 m high in 15.0 s. How much power does she use.

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  1. 23 March, 13:22
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    Her weight = (mass) · (gravity) = (50kg) · (9.8 m/s²)

    Work = (weight) · (height) = (50kg) · (9.8 m/s²) · (6 m)

    Power = (work) / (time) = (50kg) · (9.8 m/s²) · (6 m) / (15 s)

    Power = (50 · 9.8 · 6 / 15) · (kg · m² / s³)

    Power = 196 (kg · m / s²) · (m) / s

    Power = 196 Newton-meter/second

    Power = 196 watts
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