Concept explainers
Stopping Distance For a certain model of car the distance d required to stop the vehicle if it is traveling at v mi/h is given by the formula
where d is measured in feet. Kerry wants her stopping distance not to exceed 240 ft. At what range of speeds can she travel?
The range of speed for which the vehicle has stopping distance that do not exceed 240ft.
Answer to Problem 117E
The range of speed is
Explanation of Solution
The formula for distance to stop the car is
Substitute the value of 240ft for d in
Since the stopping distance is 240ft or less, the formula
On further simplification,
Further solve the equation as follows.
Thus,
Since the speed cannot be negative,
Therefore, the range of speed is
Chapter 1 Solutions
EBK PRECALCULUS: MATHEMATICS FOR CALCUL
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