Quote:
A hard time? We have to transfer -78324Ns of momentum to the pipe to stop it. How much momentum will all those masses give it as they pass through the turn?


I would say each 100 kg mass would transfer only (-)4000Ns
each second.

Quote:
We have to transfer -78324Ns of momentum to the pipe to stop it.


yes you do !!!
and you cant do that with only (-)4000Ns

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