Question

A 60 kg person takes 15 seconds for climbing 40 stairs. If height of stair is 25cm then what is power

Answer 1

m= 60 kg

t = 15 sec

distance = 40 stairs

height of 1 stairs = 25cm

height of 40 stairs = 25 * 40 = (1000)cm = 10m

p = w/t = f*v

v = d/t = 10/15 = 0.66 m/s

f = ma = 60 * 9.8 = 588N

P = f*v= 588*0.66 = 388.08 j