Question

A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much work did they do climbing the stairs?

Answer 1

Answer:200 W was used in climbing the stairs.

We'll begin by calculating the energy. This can be obtained as follow:

Mass (m) = 40 kg

Height (h) = 3 m

Acceleration due to gravity (g) = 10 m/s²

Energy (E) =?

E = mgh

E = 40 × 10 × 3

E = 1200 J

Finally, we shall determine the power exert in climbing the stairs. This can be obtained as follow:

Energy (E) = 1200 J  

Time (t) = 6 s

Power (P) =?

Power = 200 W

Thus, 200 W was used in climbing the stairs.