SOLUTION: The formula of d=0.044s(squared)+1.1s related to maximum speed s in miles per hour that you should travel in order to be able to stop in d feet. Suppose you have 80ft (about 10 car

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: The formula of d=0.044s(squared)+1.1s related to maximum speed s in miles per hour that you should travel in order to be able to stop in d feet. Suppose you have 80ft (about 10 car      Log On


   

Question 144268: The formula of d=0.044s(squared)+1.1s related to maximum speed s in miles per hour that you should travel in order to be able to stop in d feet. Suppose you have 80ft (about 10 car lengths) between your car and the car in front of you. Find the maximum speed you should travel. Does this seem reasonable to you. Explain.
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Given +d=0.044s%5E2+%2B1.1s+
What speed will result in a stopping distance of 80 feet?
+80+=+0.044s%5E2+%2B1.1s+
+0+=+0.044s%5E2+%2B1.1s+-+80+
use the quadratic equation with a = 0.044, b=1.1 and c=-80
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
You'll get two answers. One is negative, so that one is not an option. The other is 31.93mph.
Does that seem reasonable. Sho' nuf