use it on their heart because it say nothing about the damage delt to the object thrown and with some calculation it is going 40 MPH or 64 KMH

yous it on a monsters hart

I am the great panguino

My character carries 5 1lbs balls that he uses as weapons. This spell is awesome.

Uhh... it says that the spell is available for sorcerers and wizards twice

Quote from BadhandsBob >>

Had a silly moment where our Sorcerer felt he was being unfairly disadvantaged, the area was very empty and he didn't have anything to Catapult, the room was void of small objects but there were some very large crates and stuff, much too heavy, so as an action he threw up his dagger and then Quick Spelled this as a Bonus Action. GM thought it was a neat, so he even changed the damage type to piercing for that instance. The spell straight up killed his target and then after he Catapulted the dead guy's short sword into another enemy. The whole thing was quite comical.

Pretty cool 

I have a bit of confusion with the RAW. I understand that the 60ft is the area from which to choose an object not worn or carried. And I also understand that the object flies in a straight line of 90ft.

My question is it's unclear if that straight line is from where the object is or the casters location. If it's the casters location then there's some weird telekinesis or teleportation that is happening just before the object is launched. If it's the objects location then you could do a lot of unique things like potentially add the 60ft to the 90ft for total spell range. You could fire around corners without ever exposing yourself, you could even potentially have an object come directly back at you, or right past you.

I catapulted a moldy corn dog at a Stone Giant and it landed in the Stone Giant's ear!

Catapult can hit any object not being worn or carried. Your brain is you, it is wearing you so you are not wearing or carrying it. Your brain is usually 1-5 lbs.

(toss it into back of skull, if it doesn't kill they are very badly hurt)