Question

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

Answer 1

Answer:

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