Question
(a) Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a distance of 120 m (a fairly typical distance for a non-panic stop). (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).
1. $-2.47 \times 10^{3} \textrm{ N}$
2. $-1.48 \times 10^{5}\textrm{ N}$. The force when hitting the concrete abutment is greater by a factor of $60.0$