Question

If a car has a mass of 800kg and moves with a velocity if 25m/s what force is needed to stop the car in 50m

Answer 1

$$v^2=2as$$

$$F=ma=\frac{mv^2}{2s}$$

$$F=\frac{mv^2}{2s}=\frac{(800)(25)^2}{2(50)}=5000\ N$$