Question

a boy of mass 20 kg is when to first floor of a building having 17 steps each of 20 cm wide and 20 cm height find the pe of the boy in first floor​

Answer 1

Answer:

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

Explanation:

Hope it's helpful

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Answer 2

Answer:

verified

Verified by Toppr

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

hope it's helpful

make me brainliest answer