The formula r=2sqrt(...)5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will Acari skid at 20 mph?

looks like yours, just input 20 instead of the 60

forgot the link

http://www.jiskha.com/display.cgi?id=1329034595

The car left skid marks of 97'

To find out how far Acari will skid at 20 mph, we need to substitute the given values into the formula r = 2 √(5L).

Given:
r = 20 mph
We need to find the value of L.

Since we are looking for the distance skidded (L), we can rearrange the formula:
r = 2 √(5L)

Dividing both sides of the equation by 2:
r/2 = √(5L)

Now, let's square both sides of the equation to isolate the value of L:
(r/2)^2 = (√(5L))^2

Simplifying:
r^2/4 = 5L

To find L, divide both sides of the equation by 5:
L = r^2/20

Now we can substitute the given value of r = 20 mph into the equation:
L = (20^2)/20

Simplifying further:
L = 400/20
L = 20 feet

Therefore, Acari will skid a distance of 20 feet at a speed of 20 mph.