Question 240732
The stopping distance of (s) of a car varies directly as the square of it's speed (v).
If a car traveling at 30 mph requires 63 ft to stop,
:
find the stopping distance for a car traveling at 50 mph.
s = stopping dist at 50 mph
:
{{{63/s}}} + {{{30^2/50^2}}}
:
{{{63/s}}} + {{{900/2500}}}
cross multiply
900s = 63*2500
s = {{{157500/900}}}
s = 175 ft