Please help me with this question
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
M*g = 70*10 = 700 N. = Wt. = Force of gravity(Fg).
h = 31steps * 15m/step = 465 m.
Work = F*h = Mg * h Joules.