Question: A vehicle is test skidded on a level asphalt surface (asphalt f = 0.70) and then on an adjacent gravel shoulder (gravel f = 0.45)

A vehicle is test skidded on a level asphalt surface (asphalt f = 0.70) and then on an adjacent gravel shoulder (gravel f = 0.45) where it finally comes to a halt. The length of the skid mark on the asphalt surface was 200 feet and on the gravel shoulder 75 feet. What was the speed of the vehicle at the beginning of the skid?

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