Problema Solution
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=1/16x^2.
a. Calculate the braking distance for 30 miles per hour and 70 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?
a. The braking distance for 30 miles per hour is how many feet?
Answer provided by our tutors
a. for 30 miles per hour 56.25 See if rounding is needed round to your units.
for 70 miles per hour 306.25
b. 28
c) yes