Quote Originally Posted by cilu
With all due respect for Tom and Sravoff this question and answer is irrelevant. How can you prove that Gertrude is a goose or duck rather than a virus, rocket, metheorit or anything else?

Please people, ask more unambiguous questions.
Gertrude can not be a rocket. When a rocket hits (enters) a plane, it usually explodes or gets stopped inside the plane. Therefore the rocket can not exit (leave) the plane. And we've been sdaid Gertrude left the plane. The only way Gertrude can be a bullet or rocket is if it is strong enough to pierce through the plane and go on its path after crashing on the plane.

Also Gertrude can not be anything faster than a speeding bullet. She ("it"?) entered the plane, and then left the plane. And we're said, if I am correctly interpreting words, than people were killed "after" Gertrude left. A meteorite for an example travels too fast and it is too big to escape the plane before killing everyone.

I think this quiz case is not that ambiguous. Before reading all the answers posted I was thinking in a virus.

Well...