A vehicle made a 165 feel of skid marks on ihc asphalt befor

A vehicle made a 165 feel of skid marks on ihc asphalt before crashing. The speed, in miles per hour, the vehicle uas traveling when it started skidding can be approximated by Ihc formula s = squareroot 30df. where d represents the length of the skid marks in feet and f represents the drag factor of the road. If the drag factor for asphalt is 0.75. find the speed the car was traveling. Round to the nearest mile per hour.

Solution

Speed of the car when it started skidding is given by s =(30*d*f)^0.5 where s is in miles per hour and f is in feet;
In this case d= 0.75 (given) and F=165 feet (given)
Substituting the values we get s= (30*0.75*165)^0.5 = (3712.5)^0.5 = 60.93~= 61 miles per hour;

Thus the speed at which the car was travelling when it started skidding is 61 miles per hour