moving in the negative direction. Both cars start at the same time. (Graph only) 4. "A" car and "B" car start at the 0 m mark, traveling in the positive direction, but "B" car gets a 3 second head-start. a. Indicate on your graph the time and position at which the Buggies should collide. b. Set up and solve a system of equations that allow you to determine the time and location of the collision.