posted by Savannah .
A car with good tires on a dry road can decelerate at about 5.0m/s/s when braking. If the car is traveling at 55miles/hour, how much time does it take the car to stop?
55 mph = 80.7 ft/s = 24.6 m/s
Divide the initial speed by the deceleration rate to get the time required.
(24.6 m/s)/(5.0 m/s^2) = ? seconds