Question

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

Answer 1

First, calculate the weight

Weigth = mass x gravity = 50 kg x 9.8 m/s^2 = 490 Newton

Then, the work

Work = Weight x height = 490 N x 6m

finally, calculate the power:

Power = Work / time = (490N x 6m) / 15s

Power = 196 newton * m /s

Power = 190 watts