Originally Posted By: paul

so if I apply 500N * 8 seconds the +impulse = 4000N-s

the two impulses in the two turns cancel each other out.
ie...
the -impulse in the 1st turn is 4000N-s


Again, if the accelerator provides 4000Ns then the 1st turnaround provides -8000Ns the first time round.

Here's the sequence:
+4000Ns accelerator
-8000Ns 1st turn
+8000Ns 2nd turn
+4000Ns accelerator
-????Ns 1st turn

If I calculate the value of ???? you'll tell me I'm making it up, so you can figure it out.