As you stated, you are clearly demonstrating the reality of the issues discussed being beyond your ability.
OK. How about we both calculate the average velocity in WTF's scenario. I've already done it by the way. Do you want to have a go?
Let's see who has the better understanding, shall we?
Use the calculator provided.
That is what I used.
I know you did. That calculator is for kids doing simple problems. It doesn't make that clear, but this is where a little knowledge is a dangerous thing.
It's obvious that you can't just take the start and end velocities and take an average. For the last time:
you can only do that if the acceleration is constant.It's obvious that in WTF's example that the average velocity must be very close to 16,000km/h because that is how fast he's going for almost the whole time.
So to calculate the average you have to split it into sections (which is what I did when I outlined how a rocket could end up at 16,000km/h and go approximately 250km/h)
In WTF's example there are only 2 sections - the first second where he accelerates and then the rest of the time when he's going at 16,000km/h.
You need to calculate the distance of each part, add them up and then you can calculate the average velocity:
1 second
0-16,000 - average = 8000km/h (you CAN do that here because it's a constant acceleration)
Distance = speed * time
= 8000 * 1/3600 = 2.22222km [divide by 3600 so the units of hours match]
4m 59 seconds = 299 seconds
Distance = 16,000 * 299 / 3600 = 1328.88888km
Total distance = 2.22222 + 1328.88888 = 1331.11111
Velocity = distance / time = 1331.11111 / 5 * 60 = 15973.333km/h [times by 60 to get back to hours].
See? Not that hard. And here's the point. The fact you didn't understand that should tell you that
you do not understand any of this as well as you think you do.
And when you get into variations of g with height you're into a whole other level of complication.
You do not have the understanding to discuss this. Which isn't a crime, but in this thread you are just being a breathing Dunning-Kruger curve. My friendly advice is to recognise your own limitations in understanding before talking so confidently on things you don't know much about.