OK , I got it working.

and WOW !!!

here are the results after 101 seconds.

hold on to your hat !!!!

the force that accelerated each of the 100 kg masses
was +80N x 1000 meters = +4000N

the force that is required to decelerate each of the 100 kg masses increases every second.

so the pipe feels +4000N plus the extra for the additional
+velocity that the decelerating mass has gained through the turn.

this pushes the pipe faster and faster each second.

by the time (101 seconds) the 1st mass reaches the place it started from
the pipe has a force that causes it to accelerate in the (+) direction of +15987.072 N

and the pipe has moved a distance of +9604.559 meters.

by the time (202 seconds) the last accelerated mass reaches the place where it started from the pipe has a force that causes it to accelerate in the (+) direction of +1302187.380N

and the pipe has moved a distance of +2863843.953 meters
or +2863.843 km

its needs some improvement because it takes 6.8 minutes to reach light speed.

I dont think that would be a proper acceleration for bags of salt water.

so we might want to slow it down a bit.

but to mars at 56,000,000 km its a slow 6.8 minute cruise.

it might be best to experiment with this type of thing without people in it first.

because if something breaks they might find themselves in another galaxy the next day.

I let it run for 1 hour

and the pipe traveled a distance of

5.02576160643331E+73 meters

my program breaks it down into 1 million km units also

5.02576160643331E+64 million km








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