The same way you calculate the average speed of any object. You divide distance by time.
The average speed is the ratio between the distance and time.
If it "does not travel", the speed is zero. Not much to calculate there.
Average speed = (distance covered) divided by (time to cover the distance)
you calculate average speed by dividing the total distance to the total time.
That is just not true! If you can calculate its average speed you should be able to calculate its speed at any point in time during its flight, including its final velocity.
the average speed is the total distance traveled divided by the total time.
Yes. If an object is moving at a constant speed the average speed and the constant speed are the same.
Average acceleration = Change in speed/time so Time = Change in speed/Average acceleration
No, speed can vary and one can still calculate the average speed of an entire trip. Average speed is equal to the change in distance divided by the change in time.