A regular tennis ball and another one filled with sand are dropped at the same time from the top of a high building. Your friend says that even though air resistance is present, both balls should hit the ground at the same time because they are the same size and “plough through” the same amount of air. What do you say?
Both of the objects will increase their speeds until such time that the amount of air resistance is the same as their respective weights. We call that speed as the terminal speed. The heavier tennis ball will reach its terminal speed in more time compared to the lighter allowing it to cover more distance.
If ask if which ball will experience more air resistance, the answer is also the heavier ball. At terminal speed, air resistance is equal to the weight of the object but in opposite direction