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 sp
eed 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 140 feet?
We know that <span>0.75d=(s^2)/(30.25) , so for d=140ft 0.75 x 140= </span>(s^2)/(30.25) implies 0.75 x 140 x 30.25)= (s^2), and then s= sqrt( 0.75 x 140 x <span>30.25)=56.35 miles /hour</span>
