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P=12000W
t=?
W=30 J
P= W/t /*t
P*t=W /:P
t=W/P
t=30/1200
t=0,025s
dane P=12kW, W=30J
szukane t
P = W/t
t = W/P = 30J/12000W = 2,5 ms
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