Using f = 0.35 as a coefficient of friction, determine how fast a car was traveling if it skidded D = 300 feet. Use the formula $S = \sqrt { 30 D f }$ Express your answer to the nearest mile per hour.
A) 63 miles per hour
B) 51 miles per hour
C) 43 miles per hour
D) 56 miles per hour

Question

Quizplus · Accepted Answer

Plug in the given values and solve for S:
$$
S = \sqrt{30 * 300 * 0.35} \approx 56 	ext{ mph}
$$
Rounding to the nearest mile per hour, the answer is 56 miles per hour, which corresponds to choice D.

Using F = 0 S=30DfS = \sqrt { 30 D f }S=30Df​

Using F = 0 $S = \sqrt { 30 D f }$