Based on your observation of the Tracker videos and the calculations of average vertical velocity and acceleration, Why do you think the vertical acceleration values are not equal to the theoretical acceleration due to gravity, -9.81 meters/second2?
What can you say about your earlier prediction about which ball will land first? If your hypothesis was wrong, can you propose an alternate rationale for the observed results?

i think the answer is a, hope this : )

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.