The velocity–time graph shows how the velocity of a car changes after the driver sees an obstacle in the road.

What is the braking distance of the car?
9.6 m9.6\text{ m}9.6 m
20.0 m20.0\text{ m}20.0 m
24.8 m24.8\text{ m}24.8 m
29.6 m29.6\text{ m}29.6 m