Near the end of page 124 of your reading material you are shown a calculation to determine a car's final speed after accelerating for four seconds. If everything else in the problem remained the same.?

The final speed of the car would be unchanged because the time taken to accelerate does not affect the other variables such as initial speed, acceleration, and distance travelled. The calculation to determine the final speed only depends on these variables, so if they remain constant, the answer will also remain the same.