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If a child ran into the road 65 to 70 feet ahead of your vehicle what is the highest speed from which you could stop with good brakes before hitting him?
Wiki User
∙ 7y ago
You could stop at 20 miles per hour without hitting him.
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Assuming The Highway Code formula for stopping distances:
stopping_distance = thinking distance + stopping time
= speed + speed²/20 ft (where speed is in mph)
→ 65 = speed + speed²/20
→ speed² + 20speed + 1300 = 0
→ speed = -10 + 10√14 mph ≈ 27.4 mph
(The negative square root can be ignored as it gives a negative speed which is nonsense for this problem.)
However, this assumes that you observe, think and can start braking within 15/22 (≈ 0.68) seconds of the child running into the road (1ft for every 1 mph of speed), and your braking matches the Highway Code assumptions for good tyres, brakes and dry road conditions.
Wiki User
∙ 7y ago
Wiki User
∙ 7y agoBecause of reaction time to hit the brakes, about 20 mph
Anonymous
40
Anonymous
40
Anonymous
20
Anonymous
20 mph
Anonymous
20
Anonymous
20
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