This sounds like a scene from batman....

I have the answer.
.

The moving object is going to be a cube made entirely of hydrogen, and the static object is going to be a cube made entirely of antihydrogen (positron, antiproton). When they collide they will annihilate each other.

It Cannot be "stopped" but it can be annihilated (transformed)

This post was edited by RedFromWinter on Jul 19 2009 12:32am

Which is exactly why neither cube can actually exist, because of this contradiction, and hence why this scenario is impossible.

And yes, what I'm trying to get at is that in this case inf-inf=0, because even if you add 10 to both sides, it becomes 10=10, because the infinities remain separate to the rest of the equation. This is because infinity is a concept that basically means 'a number as big as you want', not a number in and of itself.
The two forces must be equal as per Newton's Law of equal and opposite reaction, despite both of them being infinite, and the net force will be zero.

to do actual addition on it replace it with any number you care for

9001-9001=0
9002-9002=0
.....
inf-inf=0, because the two 'infinite forces' MUST be equal and opposite. Forget infinity as a number, replace it with 'enough force'. enough force-the same force=0.

reread genius, i stated that in my answer -- my definition of infinity is different, I have not defined it as any set number -- but a number that increases when necessary (of course that never really happens, but such would be the set conditions for an object that couldn't be stopped)

Immovable object vrs unstoppable force paradox. Theres no solution.

well if i had to answer that, i would assume a few things
1) either after bumping into eachother, the one that can move without stoping, would just go the opposite direction,
ie: someone running into a tree, they will just be pelted backwards
2) if this thing that has to move at all times, it will just repeatly push itself into this object that cant move..
the cube, say, is still moving but we can't see it, the atoms and other things are still doing what they would if it was still going.

Impossible scenario.
Welcome to the real world.

There is. The immovable object wins.

Source: That one time that Thor fought the Juggernaut and the Juggernaut ran into Mjolnir but couldn't move it.

The solution for the immovable object, of course, is that eventually the unstoppable force will get bored and try some other angle, at which point the immovable object will take advantage of the grip of the unstoppable force and fly to the moon to drop it off.

True story.

I vouch this, I was there.

If infinity cancels infinity, the moving object has no net force on it. So it doesn't stop, it keeps moving... similarly the immovable object has no net force so it doesn't get moved. So hypothetically the unstoppable object will go through the immovable object, which is impossible in this circumstance.

This post was edited by jambre on Jul 19 2009 05:25pm

Perhaps it bounces off and travels in another direction.