Q3.A boy of mass 50 kg climbs 12steps each of height 20 cm in 50 seconds. Calculate the power used by the boy in climbing the stairs.
By definition, the power is the work "A" divided by time "t=50s" :
The work done by the boy is:
where "m = 50kg, g=9.8m\/s^2" and "h = 12\\cdot 20cm = 2.4m" is the total height. Thus, obtain:
Answer. 23.52W.
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