The average velocity has two parts to it: The average speed and the average direction.
The average speed is:
(the distance you travel between 0 and 3 seconds) divided by (3).
The average direction is:
the direction from (the place where you started at 0 seconds) to (the place where you finished at 3 seconds).
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what is the change in speed or velocity? average acceleration will be change in speed or velocity divided by time taken (4 seconds in ur case)
It is 20 seconds.
Average Velocity = change in position/change in time V = 35.2 m - 0 m/6.7 s - 0 s 4.8 m/s
If velocity is steady and doesn't change, then there is 0 acceleration.
On Earth gravity equals 9.8 m/s^2. If you multiply that by 8 seconds you get: 78.4m/s