I have a 7 month old puppy. Today he has been throwing up clear stuff and just lying around. I found him in my daughter's room this morning where he chewed up several things. I am concerned that this may be from the car that hit him on Sunday.

Have you taken him to a vet, especially since he was hit by a car?

It could be from being hit by a car, it could be that he swallowed something he shouldn't have or he could just have an illness. The only answer here is to see a vet.

I am going to echo the advice given here. To the vet.