SOLUTION: D=0.04V2 + 0.8v Where v=velocity speed in mph and D=distance. How fast was a vehicle traveling if the skid mark was 285 feet?

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Question 864461: D=0.04V2 + 0.8v Where v=velocity speed in mph and D=distance. How fast was a vehicle traveling if the skid mark was 285 feet?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
D=0.04V^2 + 0.8V
285=0.04V^2+0.8V
0.04V^2+0.8V-285=0 MULTIPLY BY 100
(4V^2+80V-28,500=0
(V-75)(V+95)=0
V-75=0
V=75 MPH. ANS.