# Physics

How much work is done by a boy of mass 70kg who ran up a flight of 31steps each15m high. Take g=10m/s^2

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1. M*g = 70*10 = 700 N. = Wt. = Force of gravity(Fg).

h = 31steps * 15m/step = 465 m.

Work = F*h = Mg * h Joules.

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