SOLUTION: The formula D=0.054x^2+0.058x describes the distance in feet D that it takes to stop a vehicle traveling x miles per hour on dry pavement.
A. How fast can you drive if you wish
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Question 738681: The formula D=0.054x^2+0.058x describes the distance in feet D that it takes to stop a vehicle traveling x miles per hour on dry pavement.
A. How fast can you drive if you wish to be able to stop your car within 65 feet?
B. On black ice, a trucks stopping distance is 2 times its stopping distance on dry pavement. A truck traveling 20 miles per hour applies the brakes, on black ice, at a distance of 65 feet in front of a rubber traffic cone. Will the truck hit the cone?
C. A motorboat heads upstream a distance of 24 miles on a river with current running 3 miles per hour. The trip up and back takes 6 hours. Assuming the motorboat maintained a constant speed relative to the water, what was it's speed?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If you want to be able to stop in 65 feet, the question becomes "what 
value do I need so that 
.
which is to say:
Just solve the quadratic using the quadratic formula. Of course, you must discard the negative root. Negative speed in this context is absurd.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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