The state driver's manual lists the reaction distances, braking distances, and total stopping distances for automobiles traveling at different initial speeds (Table 1.12). Use the data determine the driver's
reaction time interval and the acceleration of the automobile while braking. The numbers assume dry surfaces for passenger vehicles.

Table 1.12: Data from driver's manual.

Speed(mi/h)
20
40
69

Reaction distance(m)
7
13
20

Braking distance(m)
7
32
91

Total Stopping Distance(m)
14
45
111