Question 34

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Police use the function V (L) =

= √20L to estimate the speed of a car in miles per hour, based on the length,

L, in feet, of its skid marks when suddenly braking on a dry, asphalt road.

Round your answers to the nearest tenth as needed

a) At the scene of an accident, a police officer measures a car's skid marks to be 117 feet long. Approximately

how fast was the car traveling?

The car was traveling at approximately

b) One of the people involved in the accident says that he was traveling 60 mph when he braked. How long in

feet should his car's skid marks be?

The skid marks should be approximately

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miles per hour.

feet long.