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Zorluk: KolayStopping Distances

Under normal, dry road conditions and standard reaction times, match each vehicle speed to its official total stopping distance as stated in The Highway Code.

  • 20 mph20\text{ mph} (32 km/h32\text{ km/h})12 metres12\text{ metres} (40 feet40\text{ feet})
  • 30 mph30\text{ mph} (48 km/h48\text{ km/h})23 metres23\text{ metres} (75 feet75\text{ feet})
  • 50 mph50\text{ mph} (80 km/h80\text{ km/h})53 metres53\text{ metres} (175 feet175\text{ feet})
  • 70 mph70\text{ mph} (112 km/h112\text{ km/h})96 metres96\text{ metres} (315 feet315\text{ feet})

Cevap

20 mph20\text{ mph} matches 12 metres12\text{ metres} (40 feet40\text{ feet}), 30 mph30\text{ mph} matches 23 metres23\text{ metres} (75 feet75\text{ feet}), 50 mph50\text{ mph} matches 53 metres53\text{ metres} (175 feet175\text{ feet}), and 70 mph70\text{ mph} matches 96 metres96\text{ metres} (315 feet315\text{ feet}).
According to The Highway Code, overall stopping distance is the sum of thinking distance and braking distance on a dry, level road. For 20 mph20\text{ mph}, the total is 12 metres12\text{ metres} (40 feet40\text{ feet}); for 30 mph30\text{ mph}, it is 23 metres23\text{ metres} (75 feet75\text{ feet}); for 50 mph50\text{ mph}, it is 53 metres53\text{ metres} (175 feet175\text{ feet}); and for 70 mph70\text{ mph}, it is 96 metres96\text{ metres} (315 feet315\text{ feet}).

Adım Adım Çözüm

1
Recall the formula for total stopping distance
Total Stopping Distance = Thinking Distance + Braking Distance
Stopping distance consists of both reaction time travel and mechanical braking travel.
2
Apply Highway Code values for each specified speed
20 mph:6 m+6 m=12 m20\text{ mph}: 6\text{ m} + 6\text{ m} = 12\text{ m}; 30 mph:9 m+14 m=23 m30\text{ mph}: 9\text{ m} + 14\text{ m} = 23\text{ m}; 50 mph:15 m+38 m=53 m50\text{ mph}: 15\text{ m} + 38\text{ m} = 53\text{ m}; 70 mph:21 m+75 m=96 m70\text{ mph}: 21\text{ m} + 75\text{ m} = 96\text{ m}.
These are the standard baseline figures established in The Official Highway Code for good, dry conditions.
3
Link each speed entry to its corresponding total distance value
Each speed is accurately paired with its official total stopping distance.
Ensures all four pairs are matched correctly without swapping braking distance or thinking distance.

Anahtar Kavram

Highway Code stopping distances increase non-linearly with speed due to braking distance expanding with kinetic energy.
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Stopping Distances

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