document.write( "Question 861068: Solve for k, give the equation of variation, and solve the problem.
\n" ); document.write( "The stopping distance \"d\" of a car after the brakes have been applied varies directly as the square of the speed \"r\" if a car traveling 60 mph can stop in 200 feet, how fast can a car travel and still stop in 72 feet? \n" ); document.write( "

Algebra.Com's Answer #518812 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "Let k represent the constant of the direct variation
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document.write( "D = kr^2
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document.write( "2000/60^2 = k = .56
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document.write( "d = .56r^2
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document.write( " = 11.3mph
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