[away3d] Advice about physics engins

[andreyMK]

Please give me advice about physics  engins and Away3D
I need to take into account the rate of displacement, the force of
impact and angle of reflection
What advise to use?
I khow wow-engine & jiglib but never used them befor
What could be simpler?
Who has used , could you described in a few words about each?