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W = 9 kJ = 9 000 J
t = 10 s
szukane:
P = ?
P = W/t
P = 9000J/10s
P = 900 W = 0,9 kW
1 kW = 1000 W
W=9kJ = 9000 J
P=?
W=Pt /:t
W/t = P
P= 9000 J /10 s = 900 W