A boy weighing 35 kg runs up
a flight of 40 steps, each 20
cm high in 1 minute, Calculate:
(i) the work done (ii) power
spent(g=9.8 m/s^2) *
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Distance = 40 × 20cm
= 800cm = 8m
(i) W = F.S = mg × S
= 35 × 9.8 × 8
= 2744 J
(ii) P = W/t
= 2744/60
= 45.73 J/s
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