First slide
Work
Question

A person of mass 60kg carrying a load of 20kg walks up a stair case. If width and height of each step are 0.25m and 0.2m respectively, the work done by man in walking up 10 steps is  (g=10ms2)

Moderate
Solution

W=m1+m2g×nhW=80×10×10×0.2W=1600J

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