Because of alcohol a driver's reaction time rises from 1 s to 2 s. At 72 km/h, how much farther does the car travel before braking starts?
Answer and explanation
Correct answer: D. 20 m
- Step 1: Speed: m/s.
- Step 2: Extra reaction time s, so the extra distance is m.
Answer
20 m.
Why not the others: 40 m is what you get if you use the whole new reaction distance. 60 m is what you get if you add the two reaction times instead of subtracting. 72 m is what you get if you forget to convert km/h to m/s.
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