|MLA Citation:||Bloomfield, Louis A. "Question 1200"|
How Everything Works 25 May 2018. 25 May 2018 <http://howeverythingworks.org/print1.php?QNum=1200>.
However, because there would be air resistance unless you maintained a vacuum inside the hole, the ball wouldn't rise to its original height after each passage through the earth. It would gradually loss energy and speed, and would eventually settle down at the very center of the earth.Finally, the reason for drilling the hole from the north pole to south pole is to avoid complications due to the earth's rotation. If you were to drill the hole anywhere but through the earth's rotational axis, the ball would hit the sides of the hole as it fell and its behavior would be altered.