Police use the formula \(v=2 \sqrt{5 L}\) to estimate the speed of a car, \(v\),
in miles per hour, based on the length, \(L\), in feet, of its skid marks upon
sudden braking on a dry asphalt road. Use the formula to solve Exercises
77-78.
A motorist is involved in an accident. A police officer measures the car's
skid marks to be 245 feet long. Estimate the speed at which the motorist was
traveling before braking. If the posted speed limit is 50 miles per hour and
the motorist tells the officer he was not speeding, should the officer believe
him? Explain.