My teacher puzzled me in the beginning of the year by saying that one cannot possible hit a falling feather with 200 Newtons because a falling feather doesn't have 200 Newtons to hit you back with. (Newton's Third Law)
The Attempt at a Solution
I argued with her that yes, you can hit a feather with 200 Newtons because for example if I was to use all my strength and hit a brick wall and after that with the same amount of strength hit the air in the room both would have the same force, as the force my arm produces cannot just simply vanish. She still said I was wrong and I'd really like to know why if I am wrong as she was unable to clearly answer.