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Please help me figure out this word problem: How fast was a car traveling that left skid marks 120 feet long?

  • A police accident investigator can use the formula 2 sqrt 5(I) to estimate the speed of a car in miles per hour based on the length in feet of the skid marks it left. How fast was a car traveling that left skid marks 120 feet long?

  • Answer:

    Impossible to answer with just the information you have provided. There are several other factors that must be considered, including the temperature and weather conditions, type of road surface, weight of the vehicle, type and condition of the car's tires, etc.

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That equation yields 48.99 mph. Speed = 2 * (sqrt (5 * 120)). Of course, that's just a rough estimate because as JetDoc pointed out there are many factors that affect the answer that that formula ignores.

The avg. car bakes from 60 mph to zero in 120 feet. That is with no skidding. You will need to convert the speed & distance units to all miles or feet to make it work.

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