Which hits the ground first : An apple or a watermelon?

Imagine(or try to do it if possible) holding an apple in one hand and a watermelon on another. Now, try to drop them at the same time and make sure to just release them. Eat them later but now tell me-Which one will hit the ground first?

The watermelon as an answer may seem obvious to you as it is heavier than the apple. But, when you really do this experiment you will notice that both the objects hit the floor at the same time. Maybe not exactly the same due to uneven releasing time or your laziness for not holding it at the same height. But trust me, they will hit the floor at the same time.

This is because when an object allowed to free fall, its velocity will be zero at initial but increases with the distance it traveled. This increasing or decreasing or for that matter changing in velocity is acceleration(may it be negative or positive). And for a freely falling object, the acceleration is due to the gravity. Now the acceleration due to gravity "g" doesn't depend on the mass of the object but depends on the place where it took place.

(The gravity depends on mass but not acceleration due to gravity)

Now imagine you dropped a metal ball at a certain height on Earth and recorded the time take for it to reach
the ground. Also imagine that you took the same ball to Moon and Mars (forget about the rocket, you got brain). You also recorded the time(at the same height) there and came back to Earth. When you look at the time they have to taken to reach the ground on the respective celestial bodies, you'll notice that the ball, when dropped on Earth, have taken less time to reach ground followed by Mars and Moon. This is because the places you dropped the ball are different and their gravities are also different and the gravity on Earth is greater than either of them. Less gravity then less acceleration will be due to gravity, thus more time. This can also happen on earth(place above or below sea levels) but the time will be negligible. 

Now, a question may arise in your mind that -"What will happen when I drop a feather and a ball at the same time?". The same thing happens, both hit the floor at the same time in theory. But in reality, the metal ball will the ground first. This is due to some force slowing the feather down, that is air resistance(or drag). If the feather and the ball dropped at time in a vacuum(no air) chamber then they will definitely hit at the same time.

Ball and feather in a vacuum chamber

Which hits the ground first: An apple or a watermelon?

If your answer is either one of them then read the post again and if your answer is both of them then you can keep scrolling and read other posts. ;)