a$)$

Calculate the force $($in N$)$ needed to bring a $1050$ kg car to rest from a speed of $85\mathrm{.}0$ km$/$h in a distance of $120$ m $($a fairly typical distance for a non$-$panic stop$).$

N

$($b$)$

Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in $2\mathrm{.}00$ m$.$ Calculate the force exerted on the car and compare it with the force found in part $($a$).$

force in $($b$)$

force in $($a$)$

$=$