a car is traveling 20.0 m/s when the driver sees a child standing in the road. he takes 0.80 seconds to react, then steps on the brakes and slows at -7.0 m/s squared. how far does the car go before it stops?

Answer 1

d = Vo*t + (Vf^2-Vo^2)/2a.
d = 20*0.8 + 0-(20)^2 / -14 = 44.6 m.