TZer0 said:
First of all: neither exist.
The unmovable object would have unlimited mass, the unstoppable object would be an item with mass traveling at the speed of light. If we were going to simulate a situation where an unstoppable hits a unmovable object.. the unstoppable object would probably just go through (unmovable doesn't mean not pass-through-able - two different things).
Another problem is the fact that everything in the same universe would fly towards this unmovable object.. probably at the speed of light.
First, NOTHING CAN TRAVEL AT THE SPEED OF LIGHT EVER.
EVER.
Faster, yes, slower, yes, but it cannot travel AT the speed of light as then you divide by zero. (Seriously, that's the reason)
So the equation for the momentum of these two objects is
(Infinity)(0) + (Infinity)(Near to C) = (Infinity)(0) + (Infinity)(Near to C)
The objects are basically the same, apart from the immovable one is not moving and the unstoppable one is. They must both have a mass of infinity to meet those definitions, the immovable object my definition will always have a velocity of 0 and the unstoppable object's velocity will be 99.99% of the Speed of light (C).
The equation predicts no change, which is pretty much impossible as for the unstoppable object to continue moving at near to C it would have to bounce off, which isn't shown in the equation (The velocity would be negative, which breaks the equation)
Thus, only one object can exist and the question is moot as they will never meet.