Have someone who can root, a master enhancer jedi, a pistoleer, or a ranger.
Go to the jedi enclaves on Yavin 4, have the person who can root, pull one of the sentinels then root him, the jedi will run up, whack it a few times (and kill it).
They die in 15-20 seconds, the person rooting just has to keep it rooted.
You can get 6,000 - 12,000 XP per kill. (Jedi XP)