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t=?
P=0,5kW=500W
W=5kJ=5000J
P=W/t
t=W/P = 5000J/500W=10s
ćw.2
P= 3 kW=3 000 W
Fg=3 000 N
h=s=10 m
P=W/t
P=Fg*s/t
t=Fg*s/P
t=3 000 * 10/3 000 = 10 [s]
t=W/P t=5000:500
t=5000/500 t=10s
t=10s
ćw2.
P=3kw
F=3000N
H=10m
t=P×F×H t=90s
t=3000×3000×10
t=9000000×10
t=90000000