Knowing the amount of force F and the length of time t that force is applied to an object will tell you the resulting change in its momentum ΔP . This is:
F*t = ΔP
ΔP = F*t but ΔP = mv
mv = F*t
v = F*t/m
v = 12000 N × 5 s / 2000 kg
v = 30 m/s
A/ The initial speed of the car was 30 m/s
