A car at 90 km/h has a driver with a 1 s reaction time and then brakes at 5 m/s squared. What is the total stopping distance from the moment the hazard appears?

Answer and explanation

Correct answer: A. 87.5 m

  1. Step 1: Thinking distance = 25 x 1 = 25 m; braking distance = 25 squared / (2 x 5) = 62.5 m. Step 2. Total = 25 + 62.5 = 87.5 m. Answer: 87.5 m. Why not the others: 62.5 m: 62.5 m is the braking distance alone. 25 m: 25 m is the thinking distance alone. 112.5 m: 112.5 m adds an extra second of travel that is not in the question.

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