Lure bear to cliff
If it runs around the cliff, it WILL break anything in its path because it is still aggressive towards you. Climb down the cliff and hope it stays up above and doesnt continuously run around the cliff because if it does, the cliff is much too small. However if the bear stays stuck on the other side of the cliff, then you can have an alt place objects as mentions above it at a safe distance.
After you have completely enclosed the bear, you may shoot it. 99/100 times it will simply start running away from you and run wildly around the newly constructed cage of blocks of wood magically trapping it. Keep shooting it until its eyes begin flaming. It will likely run right back to you. At this point it is no longer trying to peace you, and as such if you move from your beginning location it will likely run around and break anything blocking its path (siince its no longer peacful towards you).
If this happens hop up and down until you find a location that the bear stops trying to get to you and then shoot it until its dead. If it keeps running around in the cage after the eyes are on fire, continue shooting it.
Congrats, you just got yourself a free bear
