@Peter No, as I said "calculate mass" is just meaningless without specifying the frame. Whether Physics SE has problems or not can't be inferred from what you said so far.
@amWhy And again answered despite the answer itself speaks of "this has been asked million times" , and moreover complaining about the downvote. What has happened to this site ?
But what I found good is the comment that someone always claims that wheel-factorization makes division by $0$ meaningful , if such a question appears and someone points out that division by $0$ is not allowed.
The sidewalks are still mostly clear (the temperature has be hovering around freezing all day, so the roads and sidewalks have remained relatively clear---they are going to be dangerously frozen tomorrow morning, though).
@KReiser I would have to put on boots, and I don't like wearing boots. They are heavy.