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The breaking distance, \(\displaystyle d\), of a car is proportional to the square of the speed, \(\displaystyle r\). If a car traveling at \(\displaystyle 48\) miles per hour can stop in \(\displaystyle 165\) feet. What is the stopping distance of a car traveling 36 miles per hour? Round the solution to the nearest foot.

The equation of variation is \(\displaystyle d=kr^2\). Evaluating at the known values and solving for \(\displaystyle k\) gives \(\displaystyle 165=k(48)^2 \iff k=\frac{55}{768}\). The model is \(\displaystyle d=\frac{55}{768}r\) evaluating at \(\displaystyle r=36\) gives \(\displaystyle d=\frac{1485}{16}\approx 93\) feet

Download \(\LaTeX\) 

\begin{question}The breaking distance, $d$, of a car is proportional to the square of the speed, $r$. If a car traveling at $48$ miles per hour can stop in $165$ feet. What is the stopping distance of a car traveling 36 miles per hour? Round the solution to the nearest foot.
    \soln{9cm}{The equation of variation is $d=kr^2$.  Evaluating at the known values and solving for $k$ gives $165=k(48)^2 \iff k=\frac{55}{768}$. The model is $d=\frac{55}{768}r$ evaluating at $r=36$ gives $d=\frac{1485}{16}\approx 93$ feet}

\end{question}

Download Question and Solution Environment\(\LaTeX\)
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HTML for Canvas 
<p> <p>The breaking distance,  <img class="equation_image" title=" \displaystyle d " src="/equation_images/%20%5Cdisplaystyle%20d%20" alt="LaTeX:  \displaystyle d " data-equation-content=" \displaystyle d " /> , of a car is proportional to the square of the speed,  <img class="equation_image" title=" \displaystyle r " src="/equation_images/%20%5Cdisplaystyle%20r%20" alt="LaTeX:  \displaystyle r " data-equation-content=" \displaystyle r " /> . If a car traveling at  <img class="equation_image" title=" \displaystyle 48 " src="/equation_images/%20%5Cdisplaystyle%2048%20" alt="LaTeX:  \displaystyle 48 " data-equation-content=" \displaystyle 48 " />  miles per hour can stop in  <img class="equation_image" title=" \displaystyle 165 " src="/equation_images/%20%5Cdisplaystyle%20165%20" alt="LaTeX:  \displaystyle 165 " data-equation-content=" \displaystyle 165 " />  feet. What is the stopping distance of a car traveling 36 miles per hour? Round the solution to the nearest foot.</p> </p>
HTML for Canvas
<p> <p>The equation of variation is  <img class="equation_image" title=" \displaystyle d=kr^2 " src="/equation_images/%20%5Cdisplaystyle%20d%3Dkr%5E2%20" alt="LaTeX:  \displaystyle d=kr^2 " data-equation-content=" \displaystyle d=kr^2 " /> .  Evaluating at the known values and solving for  <img class="equation_image" title=" \displaystyle k " src="/equation_images/%20%5Cdisplaystyle%20k%20" alt="LaTeX:  \displaystyle k " data-equation-content=" \displaystyle k " />  gives  <img class="equation_image" title=" \displaystyle 165=k(48)^2 \iff k=\frac{55}{768} " src="/equation_images/%20%5Cdisplaystyle%20165%3Dk%2848%29%5E2%20%5Ciff%20k%3D%5Cfrac%7B55%7D%7B768%7D%20" alt="LaTeX:  \displaystyle 165=k(48)^2 \iff k=\frac{55}{768} " data-equation-content=" \displaystyle 165=k(48)^2 \iff k=\frac{55}{768} " /> . The model is  <img class="equation_image" title=" \displaystyle d=\frac{55}{768}r " src="/equation_images/%20%5Cdisplaystyle%20d%3D%5Cfrac%7B55%7D%7B768%7Dr%20" alt="LaTeX:  \displaystyle d=\frac{55}{768}r " data-equation-content=" \displaystyle d=\frac{55}{768}r " />  evaluating at  <img class="equation_image" title=" \displaystyle r=36 " src="/equation_images/%20%5Cdisplaystyle%20r%3D36%20" alt="LaTeX:  \displaystyle r=36 " data-equation-content=" \displaystyle r=36 " />  gives  <img class="equation_image" title=" \displaystyle d=\frac{1485}{16}\approx 93 " src="/equation_images/%20%5Cdisplaystyle%20d%3D%5Cfrac%7B1485%7D%7B16%7D%5Capprox%2093%20" alt="LaTeX:  \displaystyle d=\frac{1485}{16}\approx 93 " data-equation-content=" \displaystyle d=\frac{1485}{16}\approx 93 " />  feet</p> </p>