One surprising characteristic of the force of gravity is that the acceleration it causes in falling bodies is independent of the mass of the object. This is provided there is no air or other resistance to the motion.
In other words, a 5-pound weight would fall at the same rate as a 10-pound weight. If dropped from the same height, they would take the same time to hit the ground. Of course, in dropping a lightweight object, air resistance often will slow the lighter object down more than a heavier object.
Not only does is the acceleration of gravity independent of the mass of an object, but it is also independent of the velocity of the object parallel to the ground.
In other words, it an object is traveling at some velocity parallel to the ground, it will fall at the same rate as a stationary object. Thus a bullet shot from a gun will hit the ground at the same time as one that was simply dropped from the same height.