A girl of mass $50 k g$ climbs a flight of $100$ stairs each measuring $0.25 m$ in height in $20 s$ .[Take g= $10 \frac{m}{s^{2}}$ ]
Find the power in watts.

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Solution

Given:
Mass= $50 k g$
g= $10 \frac{m}{s^{2}}$
Height of one stair= $0.25 m$
No. of stairs $= 100$
Time $= 20 s$

To find the height of $100$ stairs :
Height of one stair= $0.25 m$
No. of stairs $= 100$
Height of $100$ stairs= $100 \times 0.25 = 25 m$

To find work done:
The formula used: Work done $= F \times s$ $= m g \times h$
$= 50 \times 10 \times 25 = 12500 J$

To find power:
The formula used: Power = $\frac{W o r k}{T i m e}$
$= \frac{12500}{20} = 625 J / s = 625 w a t t s$

Hence, the power is $625 w a t t s$ .

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A girl of mass 50kg climbs a flight of 100 stairs each measuring 0.25m in height in 20s.[Take g=10ms2]Find the power in watts.

A girl of mass $50 k g$ climbs a flight of $100$ stairs each measuring $0.25 m$ in height in $20 s$ .[Take g= $10 \frac{m}{s^{2}}$ ]
Find the power in watts.