College

A typical automobile under hard braking loses speed at a rate of about [tex]7.2 \, \text{m/s}^2[/tex]. The typical reaction time to engage the brakes is [tex]0.55 \, \text{s}[/tex]. A local school board sets the speed limit in a school zone such that all cars should be able to stop in [tex]3.6 \, \text{m}[/tex]. What maximum speed does this imply for a car in the school zone?