Quote:
This is the magnitude of the force that would deccelerate 100kg from 39.0m/s to 0 in 1 second. The mass then has to speed up again from 0 to 39m/s in the other direction, so this force is applied for 2 seconds.


I never said that the mass would be stopping , that was your
assumption.

Quote:
So over 7.8s there's:
10000N pushing one way, impulse = 78000 Ns
and 20 masses doing U-turns, which is 20 * 7808 Ns = 156200Ns in the opposite direction.


there is (((( ALWAYS )))) 1 mass in 1 turnaround and
there is (((( ALWAYS )))) 1 mass in the other turnaround.
Ive already said that Im not stopping the masses , That would be something a stupid person would do knowing that they would have to re-accelerate the masses using up precious energy.

you always seem to forget the other turnaround so your
Quote:
20 masses doing U-turns, which is 20 * 7808 Ns = 156200Ns in the opposite direction.

also has the other end attached to it.

and the result is :

+156200Ns plus -156200Ns = ZERO

they cancel each other out.

right !!!
yes right , youve agreed to it before already !!!

there is (((( ALWAYS )))) 20 masses being accelerated
and
there is (((( ALWAYS )))) 20 masses free floating

so the final result is: 20 * 3903.85N = 78077N

so at the end of the 7.8 seconds the pipe has a final pipe velocity of 156.154m/s in the opposite direction that the masses were accelerated.

its pretty clear that you are using math that is designed
to work only in your favor , by using the full stop on the masses because it would hopefully prove your point , but the only point you proved today is that you use these left handed
measures to accomplish a goal.

I guess you play around with the numbers until you see an opportunity , LOL , in fact ROFL...





3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.