Police use the formula:
v = √20L
to estimate the speed of a car, u, in miles per hour, based on the length, L, in feet, of its skid marks when
suddenly braking on a dry, asphalt road. At the scene of an accident, a police officer measures a car's skid
marks to be 165 feet long. Approximately how fast was the car traveling? Round your answer to the nearest
tenth (one decimal place) of a unit.
Answer: The car was traveling at approximately
miles per hour.