Question

a Man with a mass of 70 kg runs up a flight of 40 stairs, each 15cm high in 30 seconds. find the power of the man.

Answer 1

Here is the answer,

h=40×15 cm=400 cm=4 m

m=70 kg

P.E=mgh

     = 70 × 10 × 4

     = 2800 J

P=w÷t

 =2800÷30

 =93.33333......................