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Zorluk: KolayStopping Distances

Under good, dry driving conditions, what is the typical overall stopping distance for a vehicle travelling at 30 mph30\text{ mph}?

  1. 23 metres (75 feet)Cevap
  2. B
    14 metres (45 feet)
  3. C
    9 metres (30 feet)
  4. D
    46 metres (150 feet)

Cevap

23 metres (75 feet)
Under dry conditions, a vehicle travelling at 30 mph covers 9 metres (30 feet) during the driver's reaction time (thinking distance) and an additional 14 metres (45 feet) once the brakes are applied (braking distance), giving an overall stopping distance of 23 metres (75 feet).

Adım Adım Çözüm

1
Identify the thinking distance at 30 mph
Thinking distance is 9 metres (30 feet)
The driver travels this distance during reaction time before applying the brakes.
2
Identify the braking distance at 30 mph
Braking distance is 14 metres (45 feet)
The vehicle covers this distance once the brakes are firmly applied.
3
Calculate total stopping distance
9 metres + 14 metres = 23 metres (30 feet + 45 feet = 75 feet)
Total stopping distance equals thinking distance plus braking distance.

Anahtar Kavram

Total stopping distance equals thinking distance plus braking distance
Tahmini Süre:45s
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Stopping Distances

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