A car can travel faster when the of a road is smaller. Let's assume that the speed around a curve is to the square root of the curvature. A car is moving along the path given by f$($x$)=$ x $($these are in terms of miles$)$If the speed a car can go safely is $20$ miles per hour at $(2,32)$then what is the maximum speed a car can go safely at $(1/3,1/243)?$