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P=3kW=3000W
t=1,5h=5400s
Szukane:
W=?
P=W/t *t
Pt=W
W=3000*5400=16200000J=16,2MJ
p=3KW=3000W W=?
t=1.5 godz=5400s P=W/t /*t
W=P*t
W=3000W*5400s
W=16200000J
W=16.2MJ
praca=16.2MJ
P=W/t /*t
P*t= W
W= p*t
W= 3KW*1.5h= 4.5J
odp. Samochód wykonał prace 4.5J