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2015-04-02T19:54:38+05:30

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When the person lifts the block of mass m slowly to a height h,
force = mg
displacement (in the direction of force) = h
work done = force × displacement
                = mgh
                
When he walks horizontally a distance d while holding the block,
displacement = d
force = mg (perpendicular to displacement)
so work done = 0

So total work done = mgh + 0 = mgh

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