>>718744934 (OP)
I dont get why people keep arguing this question
I used to believe the same thing until I realized the point isn't that it's a hoola-hoop, it's that gravity affects the object as its entering AND leaving the first portal.
The moment the edge of the object is through the portal, the newly-transferring mass is gaining upward momentum through the new portal. Depending on how fast the piston is slamming downward with the entrance portal, the speed of the object would increase, as the object escaping out of the exit portal would only increase.
God, I'm actually participating in this thread again