Solve the Problem $s = S \sqrt { \frac { x } { L } }$

question 15

Multiple Choice

Solve the problem.
-Police use a formula $s = S \sqrt { \frac { x } { L } }$ , where $S$ is the test-car speed (mph) and $L$ is the test-skid length (feet) , to find the actual speed, s, in an accident which left a skid mark of length $x$ feet. Find the actual speed (to the nearest tenth) when $\mathrm { S } = 63 \mathrm { mph } , \mathrm { x } = 150 \mathrm { ft } , \mathrm { L } = 100 \mathrm { ft }$ .

• A) \(51.7 \mathrm { mph }\)
• B) \(77.2 \mathrm { mph }\)
• C) \(113.0 \mathrm { mph }\)
• D) \(94.5 \mathrm { mph }\)

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