Fred $($mass $65$ kg$)$ is running with the football at a speed of $5\mathrm{.}5$ m$/$s when he is met head$-$on by Brutus $($mass $130$ kg$),$ who is moving at $4\mathrm{.}2$ m$/$s$.$ Brutus grabs Fred in a tight grip, and they fall to the ground. How far do they slide? The coefficient of kinetic friction between football uniforms and Astroturf is $0\mathrm{.}30.$