If there were no air resistance ... like, if you were doing the experiment on the surface of the moon where there ISN'T any air ... and if you dropped a feather, a basketball, a coffee filter, a rock, a piece of kleenex, a balloon, a car, a hammer, a rose petal, a house, a computer, a bag of M&Ms, a watermelon, a mosquito, a block of ice, a gum wrapper, a shirt, a flag, a satellite dish, a golf ball, a school bus, a jumbo-jet airliner, a banana, a leaf of a tree, a trunk of a tree, an apple, a brick, an avocado, and a battleship ... all from the same height, and you let them all go at the same time, they would all fall together, side by side, all with the same speed and the same acceleration, and they would all hit the ground at the same time.