Assume the moon is a perfect sphere and a straight tunnel has been drilled through the center. How long would it take a 1kg ball dropped from one end of the tunnel to reach the center? Ignore all resistances.

If a second 1kg ball is dropped 10 seconds after the first one, when and where in the tunnel would they first meet?

Idealized Moon Stats:
- Diameter: 3480 kilometers
- Mass: 7.38x10^22 kilograms (uniform density)

The ball would be travelling the fastest when it reaches the center but it wouldn't have a constant acceleration throughout the trip. I think the acceleration would be greatest immediately after it's dropped and the acceleration would be zero at the center. IOW, it's the opposite of the speed. That's all I know.

Posted by Danny on 2004-11-22 18:24:39