A car $[$W $=2200$ lb$,$ CD $=0\mathrm{.}25,$ Af $=21\mathrm{.}5$ ft$2]$ has an

antilock braking system that gives it a braking

efficiency of $100\%.$ The car$$s stopping distance is

tested on a level roadway with poor, wet pavement

$($with tires at the point of impending skid$),$ and $\backslash$rho $=$

$0\mathrm{.}00238$ slugs$/$ft$3.$ How inaccurate will the stopping

distance predicted by the practical$-$stopping$-$

distance equation be compared with the

theoretical stopping distance, assuming the car is

initially traveling at $60$ mi$/$h$?$ How inaccurate will

the practical$-$stopping$-$distance equation be if the

same car has a braking efficiency of $85\%?$