Odpowiedź:
A) 72 km/h = 20 m/s
B) 5 m/s = 18 km/h
Wyjaśnienie:
[tex]1 \ km = 1000 \ m\\\\1 \ m = \frac{1}{1000} \ km\\\\1 \ h = 3600 \ s\\\\1 \ s = \frac{1}{3600} \ h[/tex]
[tex]A) \ 72\frac{km}{h} = 72\cdot\frac{1000 \ m}{3600 \ s} = 72:3,6 \ \frac{m}{s} = 20\frac{m}{s}\\\\B) \ 5\frac{m}{s} = 5\cdot\frac{\frac{1}{1000}km}{\frac{1}{3600}h} = 5\cdot3,6 \ \frac{km}{h} = 18\frac{km}{h}[/tex]
