It's A. Object momentum is the only part that matters to portals, so they would just plop down.
Motion is relative, there is no sationary reference frame. From the reference frame of the portals, they do have momentum going towards the portal
Think about how fast the people will be moving through the portal, their matter will be shoved through extremely quickly so it wouldn't be right for them to suddenly lose that momentum when they're all the way through.
It's A. Object momentum is the only part that matters to portals, so they would just plop down.
Motion is relative, there is no sationary reference frame. From the reference frame of the portals, they do have momentum going towards the portal
Think about how fast the people will be moving through the portal, their matter will be shoved through extremely quickly so it wouldn't be right for them to suddenly lose that momentum when they're all the way through.