Two cars of masses \displaystyle{m}_{}

and m_

$aremov\in g\in \circ \le sofradii$r_(1) and r_(2)\displaystyle,{r}{e}{s}{p}{e}{c}{t}{i}{v}{e}{l}{y}.{T}{h}{e}{i}{r}{s}{p}{e}{e}{d}{s}{a}{r}{e}{s}{u}{c}{h}{t}\hat{{t}}{h}{e}{y}{m}{a}{k}{e}{c}{o}{m}{p}\le{t}{e}\circ\le{s}\in{t}{h}{e}{s}{a}{m}{e}{t}{i}{m}{e}{t}.{T}{h}{e}{r}{a}{t}{i}{o}{o}{f}{t}{h}{e}{i}{r}{c}{e}{n}{t}{r}{i}{p}\eta{l}{a}{\mathcal{{e}}}\le{r}{a}{t}{i}{o}{n}{i}{s}