The expanding earth and formation of satellites

Let us take an example of melted iron it is in liquid form but after sometime its upper layer solidifies but beneath it is still in liquid, same like this sun was hot initially and subsequently cooled with its upper layer being solidified, then due to sharp temperature gradient it exploded. Planets cooled down slowly and became what they are now. Let us take the example of moon for satellite. Moon is tidally locked with Earth i.e. revolves and rotates with same speed i.e. 27.322 days. If moon was part of Earth – Velocity at the time of escape will be velocity now as there is no drag. So V0=V1