>>10957514The breaking distance is the square of the speed of the automobile.
Let's write x for the speed, then the breaking distance will be something like a*x^2 with some unknown constant a.
The first example claims that at a speed of 25 m/h the automobile will require 34.9 feet to brake. We have x = 25m/h and a*x^2 = 34.9ft.
Now, how much is x^2? What value must a have, so that it becomes 34.9ft?
If you know a, what value will a*x^2 have, if x = 55 mi/h?
