Determine the change in velocity of a car that starts at rest and has a final velocity of 20m/s north

Im not too sure if I just dont understand but if something starts at rest, its not moving so Vi would be 0m/s and if the final velocity would be 20m/s North. Than the change would be 20m/s, its not asking for displacment so you don't need direction. I got my answer from doing Change in Velocity = Final velocity - Initial velocity

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2