If it takes about 26 metres to stop when travelling at 40km/h, how long do you think it will take to stop at 80km/h?
Question
If it takes about 26 metres to stop when travelling at 40km/h, how long do you think it will take to stop at 80km/h?
Solution
The stopping distance doesn't increase linearly with speed. Instead, it's a function of the square of the speed. This is because kinetic energy (which is what you're removing when you're stopping) is proportional to the square of the speed.
So if you double the speed, the stopping distance will be roughly four times longer. Therefore, if it takes 26 metres to stop when travelling at 40km/h, it will take approximately 4 * 26 = 104 metres to stop when travelling at 80km/h.
Similar Questions
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