If a 10 kg textbook and a 2 g piece of paper are dropped side by side, which will hit the ground first ?

If a 10 kg textbook and a 2 g piece of paper are dropped side by side, which will hit the ground first? How would this change if the paper were replaced with a 2 g rubber stopper? Explain.If a 10 kg textbook and a 2 g piece of paper are dropped side by side, which will hit the ground first ?
According to Galileo, who was supposed to have done this expt from the leaning tower of Pisa, all masses drop at the same rate!



He never did the expt but the idea was correct! (Newton showed this, later)



So, the book and paper SHOULD hit simultaneously BUT you need to take air resistance into account.

The paper will be badly affected and will "float" down like a leaf from a tree whereas the book will crash to earth.



Astronauts did this on the moon with a hammer and a feather and the two reached the lunar surface together - in a vacuum they would!