LAW ENFORCEMENT: A police accident investigator can use the formula S=2√ 5L (5L is under the radical) to estimate the speed s of a car in miles per hour based on the length l in feet of the skid marks it left. How fast was a car traveling that left skid marks 105 feet long?

Question

LAW ENFORCEMENT:  A police accident investigator can use the formula   S=2√ 5L (5L is under the radical)   to estimate the speed s of a car in miles per hour based on the length l in feet of the skid marks it left.  How fast was a car traveling that left skid marks 105 feet long?

phi · Answer

$$ S = 2 \sqrt{5L} $$
when L is 105 feet
we do
$$ S = 2 \sqrt{5\cdot 105}$$

thickgirl_angel · Answer

45.825