The car accelerates from 98 f/s to 121 f/s . . . a relatively modest 0.2 G .
Its average speed during the acceleration is (1/2) (98 + 121) = 109.5 f/s .
Moving at an average speed of 109.5 f/s for 3.6 seconds,
the car travels
(109.5 f/s) x (3.6 s) = 394.2 feet .
The Rest of the Story:
The car then immediately slows from 121 f/s to zero in the next 2 seconds,
because after reaching the speed of 82.5 mph and covering 394.2 feet,
it turns out that there is a Highway Patrol car with speed radar at about the
400-ft mark, whose red beacons are flashing even before the car gets there.
