The object going into the portal has no momentum so it would be A.

Everyone else is wrong. (Ragebait.)

Speed of approach = speed of separation.

If the box left the blue portal at a slower speed than it entered the yellow one, the top of the box would be moving slower than the bottom of the box, which would compact the box dramatically during the transition, but we can see that its size is unchanged and it is still square.

The top of the box is pushed rapidly out of the blue portal by the bottom of the box being thrust into the yellow portal. (The bottom of the box is pulled rapidly up into the air by the top of the box which is already moving quickly.)

Portals aren't real and so work however you want them to, but people rarely consistently apply their models.

I'd say A given how they work in the games though. Only the object's momentum is conserved. The portal doesn't transfer momentum. There may be a slight breeze coming out of the blue end as the column of air in front of the portal-plate is pushed in, but the cube is just going to flop out.

Speedy thing did not go in

Niether. Moving surfaces break portals instantaneously.

You can't place a portal on a moving surface in either game, so neither.

This was answered decades ago

Ragebait answers only

I'm giving so many people Fs on this assignment because you failed to read all the instructions.

The correct answer is B due to the graphical conservation of speed lines.

neither, no portal rules were given. Please create an Aperture support ticket.

"Speedy thing goes in, speedy thing comes out" as the cube isn't a speedy thing (no speed lines) going in, it won't be a speedy thing coming out.

Portals don’t stay on moving platforms.

But if they did, it would be A as the cube itself has no momentum.

B.

Momentum/velocity is not an intrinsic property of an object, it is a relative property between two objects in a frame of reference.

Behind the yellow portal is the part of the universe where the blue portal is. The yellow portal, and therefore the space where the blue portal is, has momentum relative to the cube.

Put yourself in the frame of reference of the cube. You see the yellow portal come toward you. Imagine there are objects on the other side of that portal. You see those objects rush toward you through the portal. Why would the objects just stop dead when you came through the portal? (If they did just stop, it would be as though you hit a wall, and you wouldn't actually go through the portal at all.)

According to a gravitationally accurate simulation a guy did for Youtube, the correct answer is_

... ah, ragebait answers only. Well, mission accomplished, probably >:3

Neither. The cube is not making contact with the portal at all, since the portal is on a stationary block with some speedy lines drawn on it. Speedy lines don't nake thingy go fast - everyone witb a gel-hairstyle knows that.

"speedy thing goes in, speedy thing comes out."

So stationary thing goes in, stationary thing comes out.

Option B. Portals already break a couple of laws of physics and can reverse entropy, but I like to think you should look at the speed of an object relative to the portal.

It should be a.

Imagine if the cube was actually a long rod and the orange portal start with the column half way inside it. Then the orange portal moves, in this case it would be very odd for the rod to jump in this scenario like in case b, the thing you would expect would be for the rod to stay still (besides tipping sideways a bit) consistent with case a.

https://www.youtube.com/watch?v=B19nlhbA7-E

Not providing a link to alternative platforms is my ragebait

Was going to post the correct Answers (A) but then looked at the post and though na. But if you want to know more about portals and how they would work in real life check this out. Great guy.

https://youtu.be/1zgBwQVr-wI

You can't put a portal on a moving platform, it has to stop moving first, so neither can happen... Unless the moving surface is a celestial body at least the size of The Moon, I guess?

If the downward moving portal hits the platform and there is some elastic rebound, then the object will bounce outward slightly.

Rage bait answer: Portals can't exist, it is from a child's game.

The real answer is the enemies we made along the way

It would probably be A because of Newton's first law of motion.

I choose A because that would mean I could use the portal to fuck myself in the ass easier.

Momentum is conserved when passing through a portal. In the reference frame of the out portal, the object has no momentum, so it plops out.

The top of that masher is clearly protecting the cube from the rain, so I'm not sure how the rain is expected to shoot the cube out as in option B.

A.

The object's momentum is preserved. Movement of the entrance portal does nothing. Think of it like stepping though a door, except you're Buster Keaton and the door hole is falling on you.

It's a superposition of both states until you make a measurement

Since nobody seemingly posted link to this absolute ... Idk, gold? It's about actually simulating space(-time?) with portals: https://youtube.com/@optozorax_en I see offspec's comment is mentioning the guy, yeah. Tldr answer is complicated.

...

Ah, ragebait answers only. Ugh, worm! Arrrr! I am so angry roar grrrr.

you know only engineer/computer science nerds post on lemmy because nobody has called out that the box looks like the box from hellraiser.

no matter what you do to it, you'll probably end up in hell.