Question

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 1

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