The speed a vehicle was traveling, s, in miles per hour, when the brakes were first applied, can be estimated using the formula:
where d is the length of the vehicle's skid marks, in feet.
a) Determine the speed of a car that made skid marks 4ft long.
b) Determine the speed of a car that made skid marks 16ft long.
c) Determine the speed of a car that made skid marks 256ft. long.