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Can the witness' statement be correct? 
20080602 

From Leria: The model S= radical 30df describes the relationship between the speed of a car , the conditions of the road, and the length of the skid marks when the car slams on the brakes. S is the speed of the car in miles per hour,
d is the length of the tires' skid marks in feet and f is the coefficient of the friction for the road.
In an accident, a car makes skid marks 85 feet long. The coefficient of friction is 0.6. A witness says that the driver was traveling faster than the speed limit of 35 miles per hour. Can the witness's statement be correct? Use algebra to explain your answer. Answered by Penny Nom. 


