) calculate the force (in n) needed to bring a 800 kg car to rest from a speed of 95.0 km/h in a distance of 105 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 2.00 m. calculate the force exerted on the car and compare it with the force found in part (a). force in (b) force in (a)