Using the Swiss rule of thumb (braking distance in metres = (speed in km/h ÷ 10)², dry road), what is the braking distance at 70 km/h?
Answer and explanation
Correct answer: B. 49 m
- Step 1: Braking distance = (70 ÷ 10)² = 7². Step 2. = 49 m. Answer: 49 m. Why not the others: 14 m results from having doubled instead of squaring. 21 m results from having used the reaction distance formula. 24.5 m results from having halved the result.
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