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# A 50kg man with 20kg load on his head climbs up 20 steps of 0.25m height each. The work done in climbing is

$(a)\;5\;J \quad (b)\;350\;J \quad (c)\;100\;J \quad (d)\;3430\;J$

Total mass $=50+20=70 \;kg$
Total height $=20 \times 0.25=5m$
Work done $=mgh=70 \times 9.8 \times 5$
$\qquad\qquad=3430\;J$
edited Aug 25, 2014