點解紙巾係書上面係係同一時間跌落地?(20點)

This is a physics question.
According to Galileo, two objects of unequal masses fall to the ground at the same time when dropped from the same elevation together.

g is nearly 9.8ms-2
張紙係書上面,therefore no air resistant for紙(因為書上面有低壓區,反而會吸張紙落去)
as a result 紙will fall FASTER than the book,
but since張紙係書上面,本書會頂住張紙,變成一齊落地