A hazard appears 50 m ahead of a car travelling at 90 km/h. The driver reacts after 1 s and brakes at 5 m/s squared. How far past the hazard's position does the car stop?

Answer and explanation

Correct answer: D. 37.5 m

  1. Step 1: Speed = 25 m/s; thinking distance = 25 x 1 = 25 m; braking distance = 25 squared / (2 x 5) = 62.5 m, so stopping distance = 87.5 m. Step 2. The car needs 87.5 m but only 50 m are free, so it stops 87.5 - 50 = 37.5 m beyond the hazard's position. Answer: 37.5 m. Why not the others: 62.5 m: 62.5 m is the braking distance alone, leaving out the thinking distance and the gap. 87.5 m: 87.5 m is the whole stopping distance, with no allowance for the 50 m gap. 137.5 m: 137.5 m adds the gap instead of subtracting it.

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