Question

Police can estimate the speed of a vehicle before the brakes are applied using the formula 0.75d=(s^2)/(30.25) where s is the speed in miles per hour and d is the length of the vehicle’s skid marks. What was the approximate speed of a vehicle that left a skid mark measuring 150 feet?
A) About 11 miles per hour
B) About 15 miles per hour
C) About 58 miles per hour
D) About 67 miles per hour

Answer 1

The answer is C.

$0.75(150) = \frac{ s^{2}}{30.25}$

$112.5 * 30.25 = s^{2}$

$3413.125 = s^{2}$

$s = 58.422$