Safety research. Under ideal conditions, if a person driving a car slams on the brakes and skids to a stop, the length of the skid marks (in feet) is given by the formula.
L(w,v) = kwv2
Where
k = constant
w = weight of car in pounds
v = speed of car in miles per hour
for k = 0.000 013 3, find L(2,000,40) and L(3,000,60).