How long does it take a car to cross a 30.0 m wide intersection
after the light turns green, if the car accelerates from rest at a
constant 2.00 m/s2.

5.48s

Explanation:

d=30m

a=2m/s²

We also have: d=at²/2, from where we get t=sqrt(2d/a).

t=sqrt(2×30/2)=sqrt(30)=5.48s

answer; how far out of place which the object finished relative to the starting location;