Question

A man of mass 80 kg runs up a flight of stairs 20 m high in 10 s. (a) how much power is used to lift the man? (b) If the man’s body is 25% efficient, how much power does he expend?

Answer 1

`p = 800 {m}^(3) {s}^( - 1)`

Step-by-step explanation:

(b)

`e = (u)/(p)`

`p = eu`

(0.25)(800)

P= 200 m^(3)/s