a. (i) A car increases its velocity from 10 m/s to 30 m/s in the first 4 s. Calculate its acceleration during this interval.
b. (ii) In the next 4 s, its velocity rises from 30 m/s to 55 m/s. Calculate its acceleration during this interval.
c. (iii) Is the car’s acceleration uniform over the entire 8 s? Justify your answer.