Marielle was in an accident. She was traveling down a road at 36 mi/h when she slammed

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Marielle was in an accident. She was traveling down a road at 36 mi/h when she slammed on her brakes. Her car left two skid marks that averaged 50 ft in length with a difference of 4 ft between them. Her brakes were operating at 80% efficiency at the time of the accident.
a. What was the possible drag factor of this road surface?
b. What were the lengths of each skid mark?
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