A boy of mass 55 kg runs up a flight of 40 stairs each measuring 0.15m. Calculate the work done by the boy?
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Solution

Mass of the boy (m) = 55 kg
Height of each stair = 0.15m
acceleration due to gravity = 10 m/s²
Total height moved by him (h) = 40 x 0.15 m = 6.00m
Work done by him in moving against gravitational pull = mgh = 55 x 10 x 6= 3300 J

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