OzMan

Interesting link, air resistance is a bigger factor than I had thought.

Thanks for the replies, I also figured about a mile straight up but now thinking maybe it's less.

Yes I did inform my son that mountains do come in various sizes

And about the what goes up must come down, haven't you ever wondered with all the guns shot in the air for NY Eve, July 4 or just for the hell of it, why you never hear of them hitting someone when they come down?