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

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Solution

Given that ,
A man whose mass is $50 k g$ climbs up $30$ steps of a stair in $30 s$
each step is $20 c m$ high

Height at 30 steps , $h = 30 \times 0.2 = 6 m$

Change in potential energy , $= m g h = 50 \times 10 \times 6 = 3000 J$
So, Work done by the man , $W = 3000 J$

Power used , $P = \frac{W}{t} = \frac{3000}{30} = 100 W$

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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.

Given that ,A man whose mass is 50kg climbs up 30 steps of a stair in 30seach step is 20 cm highHeight at 30 steps , h=30×0.2=6 mChange in potential energy , =mgh=50×10×6=3000 JSo, Work done by the man , W=3000 JPower used , P=Wt=300030=100 W

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