The list of choices that you submitted with the question
doesn't include any reasonable estimate at all.
The best estimate for the total stopping distance of a car traveling at 66 kilometers per hour would depend on various factors such as road conditions, vehicle condition, and driver reaction time. However, a rough estimate could be around 40 meters to 55 meters.
Stopping distances are measured in feet not in seconds. At 40 mph you're traveling 58.7 feet per second. The average driver reaction time is about 3/4 second which equates to 44 feet. After applying the brakes it will take approximately 82 feet to stop the vehicle. The total stopping distance for a car traveling 40 mph will be 126 feet when you include reaction time and actual stopping distance of the vehicle. If you divide 126' x 58.7' which is the distance traveled per second you get 2.14 seconds. This is assuming you're paying attention and have average reaction time while driving.
You're stopping every 5 miles, on the average.
23 meters on a dry pavement.
The distance needs to be further apart from the car in front
Depends what car it is.
When traveling 30-mph, the braking distance is 45-feet, and the total stopping distance is 75-feet. This is the length of a semi-truck and trailer.
about 22 metres
Yes
Need longer stopping distance.
Yes it will need the stopping distance of a automobile traveling at the same speed and then it will need a few hundred more feet as well.
The total stopping distance includes the perception distance, reaction time and braking distance. The distance that your vehicle is traveling and then pressing on the brake after seeing a hazard, is the total stopping distance.
When you go uphill, gravity helps slow down the car.
The stopping distance for a 3000kg car if 3000 N of force is applied when the car is traveling 10 ms is 50 meter. This is based on Newton's second law of force.
1/2
Need longer stopping distance.
50m
Yes, friction affects stopping distance. The greater the friction the lower the stopping distance; the lower the friction the greater the stopping distance.