Force of impact of an object crashing through another object at the speed of light?

Question

Hi there! I'm a debtor and I'm trying to find the force of an impact in which the DC character Lobo crashes through the Justice League Watchtower. Link here:

http://readcomiconline.to/Comic/Injustice-Gods-Among-Us-I/Annual-1?id=75226#7

I know F = m X a, so after hours upon hours upon hours of trying to understand, researching, applying, and calculating - I finally came up with the answer that the Newtons would be 0 because there's no sign of deceleration. Acceleration equals final velocity - initial velocity over time. So if he was moving say a the speed of light with an initial speed and a final speed, the change in velocity would be 0. Thus, everything following would be 0. But somehow, this doesn't seem right. Can anybody lend a hand?

D g · Accepted Answer

The force would be immense.  It would be similar to the case of a bullet being fired through tissue paper.  The bullet applys only as much force as it needs to break tissue.

But if it hit an object that could stop it the force exerted would be relative to the velocity.

Your problem is the object that has rest mass cant go at speed of light.

If it went near speed of light it would experience some force as it hits the wall but it will be small

? · Answer

I am trying to understand what you're thinking, but a I'm not really following.

First of all no physical object is able to reach lightspeed. If you create something that comes near it you might find yourself in a black hole.

Second, without deceleration there wouldn't be any impact. Even though the resultant speeds might be equivalent (which would be practically impossible, since it requires complete elastic interaction without losses), the direction of the speed has to change if you want to talk about impact.

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Force of impact of an object crashing through another object at the speed of light?

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