# Physics

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A boy whose mass is 40kg runs up a flight of 30 steps each 150mm high in 6seconds. Find the average power developed (take g as 10m/s^2.

• Physics -

work done = m g h = 40 * 9.81 * 30 * 0.150 Joules

power in Watts = work done / 6 seconds

• Physics -

g=a=10m/s^2,

M=40kg,

S=150mm/1000=0.15m*30steps each=4.5m,

F=ma=40*10=400N

.'. Power=W/t=F*s/t=F*V=1800/6 = 300W Ans// or 0.3kW Ans//

• Physics -

0.3kw

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