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Mathematics 6 Online
OpenStudy (anonymous):

...

OpenStudy (anonymous):

Police can estimate the speed of a vehicle before the brakes are applied using the formula \[0.75d=\frac{ s ^{2} }{ 30.25 }\] , where s is the speed in miles per hour and d is the length of the vehicle’s skid marks. What was the approximate speed of a vehicle that left skid marks measuring 140 feet?

OpenStudy (solomonzelman):

plug in 140 for d

OpenStudy (anonymous):

A.about10 miles per hour B.about 75miles per hour C.about 15 miles per hour D.about 56 miles per hour

OpenStudy (solomonzelman):

how many feet are in one mile?

OpenStudy (anonymous):

5280

OpenStudy (solomonzelman):

so 140 feet would be 140/5280 of a mile or 7/264

OpenStudy (solomonzelman):

\[(7/264)=s^2/30.25\]can you do it now?

OpenStudy (anonymous):

yeah

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