That depends on what vehicle you are stopping from 55 mph. the laws of physics come into play. The heavier the vehicle the longer the stopping distance. So I cannot give an accurate answer except to say that from 60 mph the average for a mid-sized car is around 135 feet.
275 feet
The stopping distance at 55 mph varies based on factors like vehicle type, road conditions, and braking efficiency. On average, it takes about stopping distance of stopping distance of 200-250 feet to come to a complete stop, which includes both the reaction distance (the distance traveled while the driver reacts) and the braking distance. If you consider a reaction time of about 1.5 seconds, this adds roughly 120 feet to the total stopping distance.
Think of the word DISTance and you have the formula D Is S times T Distance equals Speed x Time from which you can infer that Speed equals Distance divided by Time and Time equals Distance divide by Speed So in this example How long? means find the Time, and Time = Distance/Speed which equals 960miles divided by 55mph = 17hours 27minutes 16.36363636.....seconds What about stopping for coffee or a rest?
Stopping distance at 30mph = 23m
Stopping Distance = 15 feet
Stopping Sight Distance
Stopping distance at 40mph = 36m
Stopping Distance = about 146.25 feet.
Stopping distance also increases.
The stopping distance of a car increases.
Trains require a long stopping distance.
Total stopping distance is the thinking distance (The distance it takes for your brain to process the event and decide to stop the car) and the stopping distance (The distance it takes to stop the car once deceleration has begun) added together.