SOLUTION: The distance it takes to stop a car varies directly as the square of the speed of the car. If it takes 112 feet for a car traveling at 40 miles per hour to stop, what distance is r

Algebra ->  Rational-functions -> SOLUTION: The distance it takes to stop a car varies directly as the square of the speed of the car. If it takes 112 feet for a car traveling at 40 miles per hour to stop, what distance is r      Log On


   

Question 999502: The distance it takes to stop a car varies directly as the square of the speed of the car. If it takes 112 feet for a car traveling at 40 miles per hour to stop, what distance is required for a speed of 55 miles per hour?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
The distance it takes to stop a car varies directly as the square of the speed of the car. If it takes 112 feet for a car traveling at 40 miles per hour to stop, what distance is required for a speed of 55 miles per hour?
==========
d = k*s^2
------
112 = k*40^2
k = 112/1600 = 0.07
------
Equation:
d = 0.07*s^2
----------------
What distance is required for a speed of 55 miles per hour?
d = 0.7*55^2 = 211.75 ft
--------------
Cheers,
Stan H.
--------------