the car travels at 20m/s when the driver sees a child. It takes 0.8s to react, then steps on the brakes and slows at 7.0m/s^2. How far does the car go before it stops?

Answer 1

d = 20*0.8 + (Vf^2 _ Vo^2) / 2a,
d = 16 + (0 - (20)^2) / -14,
d = 16 + 28.57 = 44.57m.