$($a$)$

How high a hill can a car coast up $($engine disengaged$)$ if friction is negligible and its initial speed is $94\mathrm{.}0$ km$/$h$?$

$($No Response$)$ m

$($b$)$

If$,$ in actuality, a $750$ kg car with an initial speed of $94\mathrm{.}0$ km$/$h is observed to coast up a hill to a height $16\mathrm{.}0$ m above its starting point, how much thermal energy was generated by friction?

$($No Response$)$ J

$($c$)$

What is the average force of friction if the hill has a slope $2\mathrm{.}5$ above the horizontal?

$($No Response$)$ N $($down the slope$)$