Algebra Word Problem Help?
If a car skids on dry concrete, police can use the formula, 1/2s^2=d, to approximate the speed, s, of a vehicle in miles per hour given the length,d, of the skid marks in feet. If the length of the skid marks on dry concrete are 72 feet long, how fast was the car traveling when the brakes were applied?
Okay so I know that you can input 72 as 1/2s^2=72. After that I don't know what to do.
Can you help?
Comments
s²
-- = 72 . . . so s² = 2*72 = 144 . . . and the square root of 144 is
2