Question 815403: [ accident investigators use the formula sqrt(30fd) to determine the speed that a car was traveling in miles per hour by measuring the distance (d) in feet of its skid mark. in this formula f is the coefficient of friction for the type and condition of the road ]
1 write a simplified formula for the speed if f=0.6 for wet asphalt road
2write a simplified formula for the speed if f =0.8 for dry asphalt road
[ 3 investigators determine the speed at the time of an accident to be 50 mph and the distance of the skid marks was 105 feet. determine if the road was wet or dry. explain your answer ]
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! generic speed = sqrt( 30fd )
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wet speed:
f = 0.6
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Answer 1:
wet speed = sqrt( 18d )
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dry speed:
f = 0.8
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Answer 2:
dry speed = sqrt( 24d )
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50 = sqrt( (30*105)f )
50 = sqrt( 3150f )
50^2 = 3150f
2500 = 3150f
f = 0.7936507
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Answer 3:
the coefficient of friction for this particular accident is about 0.8 so the road was dry.
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