A man of Mast $50 k g$ climbs up a ladder of height $10 m$ . Calculate: (i) the work done by the man (ii) the increase in his potential energy. ( $g = 9.8 m s^{- 2}$ )

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Solution

Mass of man $= 50 k g$
Height of ladder, $h_{2} = 10 m$
(i) Work done by man $= m g h_{2}$
$= 50 \times 9.8 \times 10 = 4900 J$
(ii) inereme in his potential energy:
Height, $h_{2} = 10 m$
Reference point is ground, $h_{1} = 0 m$
Gravitational potential energy $= M g (h_{2} - h_{1})$
$50 \times 9.8 \times (10 - 0)$
$= 50 \times 9.8 \times 10 = 4900 J$

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