Odpowiedź :
[tex]Dane:\\W = 100 \ J\\P = 200 \ W\\Szukane:\\t = ?\\\\\\W = \frac{P}{t} \ \ \ |\cdot t\\\\W\cdot t = P \ \ \ |:W\\\\t = \frac{P}{W}\\\\t = \frac{200 \ W}{100 \ J}=\frac{200 \ W}{100 \ W\cdot s}\\\\\boxed{t = 2 \ s}[/tex]
[tex]Dane:\\W = 100 \ J\\P = 200 \ W\\Szukane:\\t = ?\\\\\\W = \frac{P}{t} \ \ \ |\cdot t\\\\W\cdot t = P \ \ \ |:W\\\\t = \frac{P}{W}\\\\t = \frac{200 \ W}{100 \ J}=\frac{200 \ W}{100 \ W\cdot s}\\\\\boxed{t = 2 \ s}[/tex]