1. How to calculate cross sectional area and force for Young's Modulus? My main issue is that I don't know my F or my Ao. Help? e=Constant 2.106 DeltaL=10mm Lo (original length of elastic)= 200mm f=? Ao=? 2. E= FLo Ao(Delta)L F= EAoDeltaLength[U/] Lo F= (2.106)(10mm)(Ao) 200mm 3. There are two unknown variables!! How can I do this?