Find the displacement in a word problem

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.

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