The braking distance D in feet required to stop a car traveling x miles per hour on dry, level pavement can be approximated by
D=1/9x^2.
(a ) CaIcuIate the braking distance for 20 miles per hour and 60 miles per hour. How do your answers compare?
(b) If the braking distance is 49 feet, estimate the speed of the car.
(c)Use a calculator to solve part (b) numerically. Do your answers agree?
Answer:
(a) _Round to the nearest tenth as needed.
(b)_speed of the car
(c)_ do the answers agree?