Two drag racers start simultaneously from rest at the opposite ends of a straight road. initially they are 400 m apart.
racer a has acceleration 4.0 m/s^2 going east and racer b has acceleration 6.0 m/s^2 going west.
(a) when and where do they meet?
(b) plot the positions of the racers versus time and verify graphically your results in part (a).