How do I Make Physics Angle on Impulse Object (object with "face" not symmetric object)?

Hi,

Sorry for the thread title which confusing :(

basically I am learning about physics, and I play around with Physics Catapult template

default

This is not a problem if the object is symmetric like sphere or an arrow. but when the object is a character with "face", that could be look weird (especially I need to turn on the "prevent rotation" check box).

I want the object facing down when falling down, and facing up when going up.

This .c3p is what I change : modified

well, the change work when the object "in the air" really look like what I need, but when the object hit floor (immoveable), the object start blinking all the time.. although I use "impulse" not "force".. I need the object periodically slow down and stop when hit floor..

Is there any other effective way to do this ? Most of the physics shoot tutorial using symmetric object.. I can't found one that look like what I try to achieve.

Anyone with awesome idea to share ? Thanks in advance