Galileo Tester

 Galileo Galilei (1564-1642) was an Italian astronomer/physicist who proposed that if two objects of different mass were dropped at the same time from the same height they would fall at the same rate due to gravity.
 Your next assignment will be to test his theory. You will do this by making some device that drops two objects...
...of different mass
...from exactly the same starting height exactly the same time
 Remember, however, that air friction must be minimal! The best place to do this would be in a vacuum but we will be doing it from the Library balcony. (creativity/resourcefulness will be rewarded)
(you must also supply the objects to be dropped)