Task 3

The formula d = 0.044s2 + 1.1s relates the maximum speed s in mph that you should travel in order to be able to stop in d feet.

Suppose you have 150 feet (about 10 car lengths) between your car and the car in front of you. Find the maximum speed you should travel to avoid a collision.

d = 044s2+1.1s
150 = 0.044s2 + 1.1s
0.044s2 +1.1s – 150 = 0

Solve by this way: S = -b ± √ b2 – 4ac

Or by finding delta d

S1= 47.2         S2=-72.2

We will take the positive number which is equal to 47.2 .. the negative number is rejected.