At a instance a traffic light turns green, a car that has been waiting at an intersection starts ahead with a constant acceleration 0f 3.20m/s. At the same instant a truck, travelling with a constant speed of 20 meters per second overtakes and passes the car. How far beyond its starting point does the car overtakes the truck?

Use your equations of motion:


d = d_0 + v_0t + \frac 1 2 at^2

For the car d_0 = v_0 = 0 and a = 3.2m/s^2. For the truck d_0 = a = 0 and v_0 = 20 m/s. Set the two equations equal and solve for t. Then put t back into either equation of motion to find d.