A car brakes to a stop in 40 m from 72 km/h. What distance does the same car need from 36 km/h under the same conditions?
Answer and explanation
Correct answer: D. 10 m
- Step 1: Halving the speed divides the braking distance by 4. Step 2. 40 / 4 = 10 m. Answer: 10 m. Why not the others: 20 m: this halves the distance but ignores the square law. 5 m: this divides by eight. 30 m: this subtracts 10 m with no basis.
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