Cześć ;-)
Od a] do b]
[tex]a] \ 8 \ \frac{m}{s}=8\cdot\frac{1 \ m}{1 \ s}=8\cdot\frac{\frac{1}{1000} \ km}{\frac{1}{3600} \ h}=8\cdot\frac{3600}{1000} \ \frac{km}{h}=8\cdot3,6 \ \frac{km}{h}=28,8 \ \frac{km}{h}\\\\b] \ 900 \ \frac{m}{min}=900\cdot\frac{1 \ m}{1 \ min}=900\cdot\frac{\frac{1}{1000} \ km}{\frac{1}{60} \ h}=900\cdot\frac{60}{1000} \ \frac{km}{h}=900\cdot0,06 \ \frac{km}{h}=54 \ \frac{km}{h}[/tex]
Od c] do d]
[tex]c] \ 108 \ \frac{km}{h}=108\cdot\frac{1 \ km}{1 \ h}=108\cdot\frac{1000 \ m}{3600 \ s}=\frac{108 \ 000}{3600} \ \frac{m}{s}=30 \ \frac{m}{s}\\\\d] \ 72 \ \frac{m}{min}=72\cdot\frac{1 \ m}{1 \ min}=72\cdot\frac{1 \ m}{60 \ s}=\frac{72}{60} \ \frac{m}{s}=1,2 \ \frac{m}{s}[/tex]
Pozdrawiam! ~ JulkaOdMatmy
