Question

A man mass 60 kg run up a flights 30 steps in 15 second if each steps is 21 cm high calculate the power developed by the man

Answer 1

each step = 20cm

30 steps = 30×20= 600 cm = 6 m

now, power = W/Time

for work to be done we need force × displacement

force= mg

therefore W= mgh

= 60 × 9.8 × 6

= 3528 J

power = W/T

= 3528 ÷ 15

= 235 watt.