# Two continuous balls of the same size (one wooden, the other aluminum) freely fall from a sufficiently high height with zero

**Two continuous balls of the same size (one wooden, the other aluminum) freely fall from a sufficiently high height with zero initial speed. Which of the balls will have a greater velocity at the surface of the Earth?**

1. The aluminum ball will have more speed.

2. At a sufficiently high height of incidence, the balls will reach their ultimate rate of incidence. The limiting speed of a body’s fall is determined by the condition of equality of the air resistance force (with equal shape and size proportional to the speed of each body) and gravity. The force of gravity acting on an aluminum ball is greater, since the density of aluminum is greater than the density of a tree and, with equal volumes, its mass is greater. Consequently, the limiting speed of fall of an aluminum ball is greater.