Last night my friends and I had a discussion about a science riddle that one of them had brought up. The question triggered some debate and the four of us were split in half with our answers. The question/riddle is: If you're standing on top of a train traveling at 50mph and you throw a baseball in the direction that you're moving which leaves your hand at 50mph, what will happen to the baseball? This experiment would be done under controlled conditions i.e. no wind or anything other than the atmosphere acting as an opposite force.