94. Speed of a Skidding Car Police use the formula s = V30fd to estimate the speed s (in mi/h) at which a car is traveling if it skids d feet after the brakes are applied suddenly. The num- ber f is the coefficient of friction of the road, which is a mea- sure of the "slipperiness" of the road. The table gives some typical estimates for f. Tar Concrete Gravel Dry 1.0 0.8 0.2 Wet 0.5 0.4 0.1 (a) If a car skids 65 ft on wet concrete, how fast was it mov- ing when the brakes were applied? (b) If a car is traveling at 50 mi/h, how far will it skid on wet tar?
94. Speed of a Skidding Car Police use the formula s = V30fd to estimate the speed s (in mi/h) at which a car is traveling if it skids d feet after the brakes are applied suddenly. The num- ber f is the coefficient of friction of the road, which is a mea- sure of the "slipperiness" of the road. The table gives some typical estimates for f. Tar Concrete Gravel Dry 1.0 0.8 0.2 Wet 0.5 0.4 0.1 (a) If a car skids 65 ft on wet concrete, how fast was it mov- ing when the brakes were applied? (b) If a car is traveling at 50 mi/h, how far will it skid on wet tar?
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.3: Zeros Of Polynomials
Problem 67E
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Question
Speed of a Skidding Car Police use the formula
s "30fd
to estimate the speed s (in mi/h) at which a car is traveling if
it skids d feet after the brakes are applied suddenly. The number f is the coefficient of friction of the road, which is a measure of the “slipperiness” of the road. The table gives some
typical estimates for f
Transcribed Image Text:94. Speed of a Skidding Car Police use the formula
s = V30fd
to estimate the speed s (in mi/h) at which a car is traveling if
it skids d feet after the brakes are applied suddenly. The num-
ber f is the coefficient of friction of the road, which is a mea-
sure of the "slipperiness" of the road. The table gives some
typical estimates for f.
Tar
Concrete
Gravel
Dry
1.0
0.8
0.2
Wet
0.5
0.4
0.1
(a) If a car skids 65 ft on wet concrete, how fast was it mov-
ing when the brakes were applied?
(b) If a car is traveling at 50 mi/h, how far will it skid on wet
tar?
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