1. The problem statement, all variables and given/known data A car is slowing down at a rate of 20 km/h/s. How far does it travel if its original velocity is 50 km/h and its final velocity is 5.0 m/s? 2. Relevant equations vf2 = v02 + 2aΔx 3. The attempt at a solution vf2 = v02 + 2aΔx Δx = (vf2 - v02) / 2a = (182-502) / 2(-20) = -2176 / -40 = 54.4 m That's wrong, though. The answer should be 15 m.