Q. 347 - Intermediate Algebra

Question

The skid marks for a car involved in an accident measured 216 feet. Use the formula $s=\sqrt{24d}$ to find the speed of the car before the brakes were applied. Round your answer to the nearest tenth.

Step-by-Step Solution

Answer

The speed of the car before the brakes were applied is 72 feet/second.

Step 1. Given information

The skid marks for a car involved in an accident measured 216 feet.

$d=216 feet$

Step 2. Finding speed by using the formula

$$\begin{gathered} s=\sqrt{24d} \\ s=\sqrt{24\times 216} \\ s=\sqrt{4\times 6\times 6\times 6\times 6} \\ s=2\times 6\times 6=72 \end{gathered}$$