Place a small sheet of paper beneath a book and drop both simultaneously. They accelerate equally because the book pushes down on the paper. Now drop both with the paper on top of the book (but not sticking out beyond the edge of the book)
Which has the greater acceleration? Why?
Both book and paper will accelerate equally. The book breaks a clean path through the air, so the paper experiences no air drag. Then the net force on the paper is only its weight. This has to be done to be appreciated.
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