The mass of an object has no effect whatsoever on the object's acceleration during free-fall. If there is no air resistance to interfere with the natural effects of gravity, then a feather and a battleship ... dropped at the same time ... fall together, and hit the ground at the same time.
It doesn't. If you took a watermelon and an orange and dropped them at the same time, they would fall the same speed snd land (or squash) at the same time. Try it. It doesn' have to be those two fruits.
To solve this problem we will begin by finding the pressure through density and average depth. Later we will find the Force, by means of the relation of the pressure and the area.