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Difference between Internal Energy and Enthalpy

A person of m...

Question

A person of mass $60$ kg with a load of $20$ kg on his head climbs upto a height of $10$ m in $4$ s. Calculate his power. Given $g = 10 {m s}^{- 2}$

2000 W

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200 W

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4000 W

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8000 W

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Solution

The correct option is A $2000 W$
$M = 60 g$
Load mass $= 20 k g$
Work done $= \int N . d r = 80 g .10 m = 80 \times 10 \times 10 = 8000 J$
$P o w e r = \frac{W o r k d o n e}{Δ t} = 2000 W$

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