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16 votes
16 votes
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

User Richard Gomes
by
2.5k points

1 Answer

6 votes
6 votes

ANSWER:

14.7 miles per hour

Explanation:

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


s=\sqrt[]{18d}

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


\begin{gathered} s=√(18\cdot12) \\ s=14.7\text{ miles per hour} \end{gathered}

The speed of car is 14.7 miles per hour

User TwistedSim
by
3.0k points
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