SOLUTION: Investigators at a traffic accident use the equation: D = 0.04v2 + 0.8v where v is the velocity (speed in mph) of the car before starting to stop and D is the stopping distance (

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Question 770359: Investigators at a traffic accident use the equation: D = 0.04v2 + 0.8v where v is the velocity (speed in mph) of the car before starting to stop and D is the stopping distance (length of the skid marks). If the skid marks are 192 feet long, how fast was the car traveling prior to the accident?
Please provide the steps.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Investigators at a traffic accident use the equation: D = 0.04v2 + 0.8v where v is the velocity (speed in mph) of the car before starting to stop and D is the stopping distance (length of the skid marks). If the skid marks are 192 feet long, how fast was the car traveling prior to the accident?
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Solve:
0.04v^2+0.8v-192 = 0
4v^2 + 80v - 19200 = 0
v^2 +20v - 4800 = 0
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(v-60)(V+80) = o
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v = 60 mph
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Cheers,
Stan H.
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