Help!! The height of an object launched upward from ground level is given by the function s(t) = -4.9t2 + 78.4t, where s(t) is the height in meters and t is the time in seconds. Arrange the time intervals in ascending order of the object's magnitude of average velocity over the interval.

Time interval options:
8 to 11 seconds
6.5 to 8 seconds
2 to 2.5 seconds
4 to 4.5 seconds
3 to 3.5 seconds
9 to 11 seconds
9.5 to 10 seconds