Question

find the power of a body of mass 30 kg climbing a staircase of 30 steps in 15 sec each step measuring a height of 15cm .(g=10ms-2)​

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=tW=303000=100 W

Answer 2

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= w/ t = 3000 /30=100 W

p = 100W

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