Question

A man of mass 50kg runs up a flight of stairs having a rise of 5m in 4sec
(a) what is the work done by the man?
(b) what is the average power developed by the man?​

Answer 1

Answer:

m=50kg

s=5m

t=4sec.

let u = 0

s=ut +1/2at^2

5=0+1/2a4*4

5=8a

a=5/8

F=ma

F=50*5/8

F=31.25

w=FS

W=31.25*5

W=156.25

P=W/T

P=156.25/5

P=31.25Watt