13. A van is cruising at \( 22.5 m / s \) (about \( 50 mph \) ) when a deer runs across the road and the driver has to hit the brakes; the van can reduce its speed by \( 7.1 m / s \) every second. A lighter sports car in the next lane is travelling \( 30 m / s \) (about
\( 67 mph \) ) and can slow down by \( 9.6 m / s \) each second. After how many seconds of braking do the two vehicles have the same speed? A). \( 2 \) B) \( 3 \) C) \( 4 \) D) Only after they reach a full stop.