Question

A car is traveling at 16.0 m/s, and the driver sees a traffic light turn red. After 0.500 s (the reaction time), the driver applies the brakes, and the car decelerates at 8.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first sees the red light?

Answer 1

.5 * 16 = 8 meters before brakes so add that at the end

v = Vi - 8 t
0 = 16 - 8 t at stop
t = 2 seconds braking

d = Vi t - (1/2) a t^2
d = 16*2 - 4 (4)
d = 16 meters

8 + 16 = 24 meters