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If a child ran into the road 65 to 70 feet ahead of you vehicle what is the highest speed from which you could stop could stop with good brakes?
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.
What else can I help you with?
If a child runs into the road 45 to 50 feet ahead of your car what is the highest speed from which you can stop with good brakes without hitting him?
15 mph
F 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?
The stopping distance of a vehicle depends on its speed and the braking efficiency. At 65 to 70 feet ahead, if we assume good brakes and average reaction time, a vehicle traveling at approximately 20 to 25 mph could potentially stop in time, considering the average stopping distance for that speed is around 60 to 100 feet. However, factors such as road conditions and vehicle type can influence this distance. Therefore, maintaining a speed below 25 mph would increase the likelihood of stopping safely.
When parking headed downhill it is best toIf 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?
When parking headed downhill, it is best to turn your front wheels toward the curb and set the parking brake to prevent the vehicle from rolling into the street. To determine the highest speed at which you could stop before hitting a child 65 to 70 feet ahead, you should consider your vehicle's stopping distance. At a speed of approximately 20 mph, the total stopping distance (including perception and reaction time) is about 60 feet, which suggests you could stop safely within that distance. However, at higher speeds, the stopping distance increases significantly, making it unsafe to drive faster than 20 mph in this scenario.
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