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.
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Average speed during a period of time =(distance traveled during the time) divided by (length of the time period)
I'm sure that average speed would be easier to calculate than instantaneous speed. To calculate average speed, just take the time that it takes to travel between two points, and divide that into the distance between the points.
Average speed = (distance covered) divided by (time to cover the distance)
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.