First write down all the known values:
vi = 0m/s
a = 4.5m/s^2
d = 1.6km = 1600m Remember to convert to meters since the acceleration is in meters
vf = ?
Now use the kinematic equation that relates all these variables:
vf^2 = vi^2 + 2ad
vf^2 = (0)^2 + 2(4.5)(1600)
vf^2 = 14400
vf = 120m/s
The final velocity of the car is 120m/s.
