Odpowiedź :
[tex]P=\frac{W \ [J]}{t \ [s]}\\\\P=50 \ W\\\\t=1 \ min=60 \ s\\\\\frac{W}{60 \ s}=50 \ W \ \ |\cdot60 \ s\\\\W=3000 \ J=\boxed{3 \ kJ}[/tex]
[tex]dane:\\P = 50 \ W\\t = 1 \ min = 60 \ s\\szukane:\\W = ?\\\\P = \frac{W}{t} \ \ /\cdot t\\\\W = P\cdot t\\\\W = 50 \ W\cdot60 \ s\\\\W = 3 \ 000 \ J = 3 \ kJ[/tex]