Question 330338
The formula R=2sqrt5L can be used to approximate the speed R in miles per hour,
 of a car that has left skid marks of the length L in feet,
 how far will a car skid at 20 mph.
The car will skid ? feet
:
{{{R=2*sqrt(5L)}}}
:
{{{2*sqrt(5L)}}} = 20
;
{{{sqrt(5L)}}} = {{{20/2}}}
:
{{{sqrt(5L)}}} = 10
square both sides
5L = 100
L = {{{100/5}}}
L = 20 feet at 20 mph