In a test run, a certain car accelerates uniformly from zero to 4 m/s in 9.9 s.
How long (in seconds) does it take the car to change its speed from 14.9 m/s to 22.1 m/s?
How long (in seconds) does it take the car to change its speed from 14.9 m/s to 22.1 m/s?