Police use a formula $s=S \sqrt{\frac{l}{L}}$, where Sis the test- car speed and $L$ is the test- skid length, to find the actual speed $\mathrm{s}$ in an accident which left a skid mark of 1 . Find the speed (nearest whole mph) when $\mathrm{S}=45 \mathrm{mph}, \mathrm{l}=150 \mathrm{ft}, \mathrm{L}=100 \mathrm{ft}$.
A) $37 \mathrm{mph}$
B) $68 \mathrm{mph}$
C) $55 \mathrm{mph}$
D) $95 \mathrm{mph}$

Question

Quizplus · Accepted Answer

The formula to find the actual speed $s$ is $s = S \sqrt{\frac{l}{L}}$. Substituting $S = 45$ mph, $l = 150$ ft, and $L = 100$ ft into the formula gives $s = 45 \sqrt{\frac{150}{100}} = 45 \sqrt{1.5} \approx 55$ mph.

Police Use a Formula s=SlLs=S \sqrt{\frac{l}{L}}s=SLl​​ , Where Sis the Test- Car Speed And

Police Use a Formula $s=S \sqrt{\frac{l}{L}}$ , Where Sis the Test- Car Speed And