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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.
One commonly used formula for waves is: speed (of the wave) = frequency x wavelength If you know any two of these pieces of information, you can calculate the third one.
Average speed = (distance covered) divided by (time to cover the distance)
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.
Average acceleration = Change in speed/time so Time = Change in speed/Average acceleration