Question

As a traffic light turns green, a car at rest begins to move forward at a uniform acceleration of 3.1 m/s^2 [E]. At the same time, a truck passes through the intersection travelling at a constant velocity of 15 m.s [E]. At what time does the car pass the truck?

Answer 1

15 t = 1/2 * 3.1 t^2

1.55 t^2 - 15 t = 0

solve with quadratic formula