double the speed ... the stopping distance is quadrupled.
Well, I failed my driving permit test because of this one question...
If a car is going at 10mi per hour with a stopping distance of 20 feet. If the car was going 20 miles per hour how far would the stopping distance be?
Well here were the choices
20 - knew this was wrong
40 - chose this
6x - I was deciding this between 40 and 60
7x - I considered this way off.
How did I get this wrong?