Question

A girl of mass 40 kg takes a staircase of 15 steps,

each of height 20 cm. If she utilizes a power of

80 W to climb the staircase, the time taken by her

is [Take g = 10 m/s2]

Answer 1

mass=20 kg,power= 80W
DISPLACEMENT = 15*20=300cm=3m
g 10 m/s2
W K T. P= W/T
t=w/p
=F.S/P
=mg.s/p
20*10*3/80
600/80
60/8
30/4
15/2
7.5 seconds