Question

mansi, having
own mass 50 kg, climb 20m height
along with 30kg mass in 40 seconds Calculate her power and work done
(take g = 10m/s)
plz answer... Class 9 physics​

Answer 1

Explanation:

Given that ,

A man whose mass is 50kg climbs up 30 steps of a stair in 30s

each step is 20 cm high

Height at 30 steps , h=30×0.2=6 m

Change in potential energy , =mgh=50×10×6=3000 J

So, Work done by the man , W=3000 J

Power used , P=

t

W

=

30

3000

=100 W