How Far and Fast Does the Car Travel to Overtake the Truck?

[J89]

Homework Statement

At the instant the traffic light turns green, a car that has been waiting at the intersection starts ahead with a constant acceleration of 3.20 m/s squared. At the same instant, a truck, traveling with a constant speed of 20 m/s, overtakes and passes the car.
A) How far beyond its starting point, does the car overtake the truck?

B) How fast is the car traveling when it overtakes the truck?

Homework Equations

equations dealing with speed and acceleration

The Attempt at a Solution

so stuck! Don't know how to start! Help!

 

[LowlyPion]

Consider that the truck is going 20 at the moment the car starts accelerating.

At what point - like how much later - will the distance the car accelerates (x = ½*3.2*t²) be the same as the truck (x = 20*t)?