СИ = 36 км \ ч = 10 м \ с
т.к. s1 = s2 , тогда
= \frac{2 \times v1 \times v2}{v1 + v2} " alt=" < v > = \frac{2 \times v1 \times v2}{v1 + v2} " align="absmiddle" class="latex-formula">
= \frac{2 \times 10 \times 8}{10 + 8} = \frac{160}{18} = 8.9 \frac{m}{c} " alt=" < v > = \frac{2 \times 10 \times 8}{10 + 8} = \frac{160}{18} = 8.9 \frac{m}{c} " align="absmiddle" class="latex-formula">