Răspuns:
Explicație:
[tex]a) 72 \frac{km}{h}= 72 \cdot \frac{1000m}{3600s} = 20 \frac{m}{s} \\b) v = \frac{d}{t} => d = v \cdot t = 20 \frac{m}{s}\cdot 10s = 200 m\\ d = 72 \frac{km}{h} \cdot 1h = 72 km\\ c) v = \frac{d}{t} => t = \frac{d}{v} = \frac{144 km}{72\frac{km}{h}} = 2h\\ t = \frac{40m}{20\frac{m}{s} } = 2s[/tex]
