Question

If a man of mass 50Kg takes 60s to climb up 20 Steps, Each of height 15 cm, calculate his power?

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Physics

Work, Energy and Power

Power

A man whose mass is 50 kg c...

PHYSICS

A man whose mass is 50 kg climbs up 30 steps of a stair in 30 s. If each step is 20 cm high, calculate the power used in climbing stairs.

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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