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s = square root of 18d can be used to find the speed s of a car in miles per hour when the car needs d feet to come to a complete stop after slamming on the brakes. If it took a car 12 feet to come to a complete stop after slamming on the brakes, estimate the speed of the car



Answer :

ANSWER:

14.7 miles per hour

STEP-BY-STEP EXPLANATION:

We have that the speed is given by the following function:

[tex]s=\sqrt[]{18d}[/tex]

where s is calculated in miles per hour and d is given in feet, therefore, we substitute and calculate the value of the speed:

[tex]\begin{gathered} s=\sqrt{18\cdot12} \\ s=14.7\text{ miles per hour} \end{gathered}[/tex]

The speed of car is 14.7 miles per hour

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