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m=2t= 2000 kg
h=1,5m
P= 5W
Szukane:
t=?
Rozwiązanie:
E=W
Ep=m*g*h
Ep= 2000*10*1,5
Ep=30000 [J] -> W=30000J
P=W/t [W] wiec t=W/P
t= 30000/ 5
t=6000 s = 100 min= 1h 40 min
Odp. robotnik musi pracowac 1h 40 min. :)