How fast must a $2500-$kg rhino move to have the same kinetic energy as a $60\mathrm{.}0-$kg sprinter running at

$10\mathrm{.}0$ m$/$s

$($about

$22$mph

$)?($b$)$ Imagine the rhino is brought to a stop by a muddy river over the distance of

$5$ m

$.$ How much work was done by friction? $($c$)$ What was the frictional force on the rhino as is came to a stop? $($d$)$ What is the coefficient of friction between the rhino and the muddy water?