You can set a detpack near an allied online player. If they are near a tree and you angle it correctly they can be thrown into the tree. You could also do this to yourself, but it would be best to launch a sniper into the tree.
Force Pull[]
On the PC version, Yoda's Force Pull power is useable from tremendous distances, working on practically any visible enemy, making it easy to pull stormtroopers out of a crowd and pick them off one by one, or just have fun flinging unsuspecting enemies into the air.