I understand that if you drop a cannonball from a hole drilled through the earth from pole-to-pole, the ball would reach a speed of 18,000 mph at the center, and then slow to a speed of zero at the other end of the hole. Can anyone give me a mathematical explanation of this?(adsbygoogle = window.adsbygoogle || []).push({});

thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Cannon Ball Paradox

**Physics Forums | Science Articles, Homework Help, Discussion**