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A $50 k g$ man with $20 k g$ load on his head climbs up $20$ steps of $0.25 m$ height each. The minimum work done by the man on the block during climbing is

A

$5 J$

B

$350 J$

C

$1000 J$

D

$3430 J$

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Solution

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Correct option is C)

Mass of block(m) $= 20 k g$
Height (h) $= 20 \times 0.25 = 5 m$
Work done $W = m g h$
$= 20 \times 10 \times 5$
$W = 1000 J$

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