Question 807212
The distance required to stop a car varies directly as the square of its speed.
 If 250 feet are required to stop a car traveling 60 miles per hour, how many
feet are required to stop a car traveling 96 miles per hour? 
:
Let x = stopping distance a 96 mph
{{{x/250}}} = {{{96^2/60^2}}}
{{{x/250}}} = {{{9216/3600}}}
Cross multiply
3600x = 250 * 9216
x = {{{2304000/3600}}}
x = 640 ft to stop at 96 mph