[tex]1.\\dane:\\s = 160 \ km\\t = 2 \ h\\\\s = v\cdot t \ \ /:t\\\\v = \frac{s}{t}=\frac{160 \ km}{2 \ h} = 80\frac{km}{h}\\\\80\frac{km}{h} = 80\cdot\frac{1000 \ m}{3600 \ s} = 22,(2)\frac{m}{s}\approx22,2\frac{m}{s}[/tex]
[tex]2.\\dane:\\s = 15 \ km\\t = 20 \ min = \frac{1}{3} \ h\\szukane:\\v = ?\\\\v = \frac{s}{t} = \frac{15 \ km}{\frac{1}{3}h} = 45\frac{km}{h}\\\\45\frac{km}{h} = 45\cdot\frac{1000 \ m}{3600 \ s} = 12,5\frac{m}{s}[/tex]
