This question is typical on some driver’s license exams: A car moving at 40 km/h skids
12 m with locked brakes.
How far will the car skid with locked brakes
at 80 km/h?
Answer in units of m
80/40=2^2=4*12=48
To answer this question, we can use the concept of the relationship between speed and stopping distance.
The stopping distance of a car depends on various factors such as speed, road conditions, and the efficiency of the braking system. However, for the sake of simplicity, let's assume that the relationship between speed and stopping distance is linear. This means that if we double the speed, the stopping distance will also double.
In the given information, we are told that at a speed of 40 km/h, the car skids for a distance of 12 meters with locked brakes. Now we need to find out how far the car will skid with locked brakes at a speed of 80 km/h.
Since the relationship between speed and stopping distance is assumed to be linear, we can use the ratio of the two speeds (80 km/h / 40 km/h) to determine the ratio of the stopping distances.
Ratio of speeds = 80 km/h / 40 km/h = 2
Therefore, with the speed doubled, the stopping distance will also be doubled.
Now, we can calculate the skid distance at 80 km/h by multiplying the skid distance at 40 km/h by the ratio of stopping distances:
Skid distance at 40 km/h = 12 meters
Ratio of stopping distances = 2
Skid distance at 80 km/h = Skid distance at 40 km/h * Ratio of stopping distances
= 12 meters * 2
= 24 meters
So, the car will skid for a distance of 24 meters with locked brakes at a speed of 80 km/h.