A driver travelling at 126 km/h needs 1 s to react to a hazard. How far does the car travel before the driver starts to brake?
Answer and explanation
Correct answer: C. 35 m
- Step 1: Speed in m/s = 126 ÷ 3.6 = 35 m/s. Step 2. Distance = 35 × 1 = 35 m. Answer: 35 m. Why not the others: 126 m results from having treated km/h as m/s. 17.5 m results from having halved the reaction time. 70 m results from having doubled the reaction time.
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