The balls to reach the ground below will be above the same for both balls. The heavier ball will take considerably less time than the lighter ball, but not necessarily half as long. The two metal balls of the previous problem roll off a horizontal table with the same speed. In this situation, the heavier ball hits the floor at about half the horizontal distance from the base of the table than does the lighter ball. The lighter ball hits the floor considerably closer to the base of the table than the heavier ball, but not necessarily at half the horizontal distance. A stone dropped from the roof of a single-story building to the surface of the earth reaches a maximum speed quite soon after release and then falls at a constant speed thereafter. It speeds up as it falls because the gravitational attraction gets considerably stronger as the stone gets closer to the earth. The force of the air pushing it downward causes it to fall.