Odpowiedź :
[tex]dane:\\W = 400 \ J\\t = 7 \ s\\szukane:\\P = ?\\\\P = \frac{W}{t}\\\\P = \frac{400 \ J}{7 \ s}\approx57,1 \ W[/tex]
[tex]dane:\\W = 400 \ J\\t = 7 \ s\\szukane:\\P = ?\\\\P = \frac{W}{t}\\\\P = \frac{400 \ J}{7 \ s}\approx57,1 \ W[/tex]