Question

Rohan climbs a flight of stairs in 100 seconds while Peter climbs the same flight of stairs in 50 seconds. Which one of them has done more work? Who has more power? Give scientific reasons for your answer.​

Answer 1

Answer:

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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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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:

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