Aww those innocent little rug rats really have a way with electronics huh?
They just seem to have nothing better to do but destroy our toys and well as their own. LOL
It is obvious the computer has suffered some internal damage, it may beyond your ability to fix the damage, specially if a circuit board has cracked from the impact.
It sounds to me that if the computer is still starting up at all that there may be a cooling fan that became dislodged from its holding bracket, that would be the whinning noise you most likely heard.
I leave the choice up to you, but if it was me, I would take this laptop in for servicing by a qualified repair shop that works on laptop computers.
If you feel you can trust your abilities to attempt this task yourself, I will attempt to point you to some web sites which may provide some technical service information.
I think, it may be best rather than do something you'll regret later, you take it to a shop and let them deal with the headache.
Laptops are very complex devices to work on.