Question

Physics help?

I have to do a lab with the times and distances of which a ball falls on the Earth, moon, and Mars. I have all my values (time in terms of seconds, distance in terms of meters) but I'm supposed to find the average velocity, and average acceleration (using speed) and I'm really confused.

For example, the values for earth are:
0.0s - 0m
0.2s - 0.23m
0.4s - 0.86m
0.6s - 1.87m
0.8s - 3.23m
1.0s - 4.91m

Average velocity = displacement / time, so

4.91m / 1s = 4.91m/s

Average acceleration = change in velocity / change in time.

(4.91 - 0) / (1 - 0) = 4.91 m/s^2

I'm just not sure how all these values could be the same, or what I'm doing wrong?


Average speed = distance/time which in this case would be the same as average velocity. I'm really lost, please help