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February 1, 2015

February 1, 2015

Posted by **Deforest** on Tuesday, June 7, 2011 at 12:46pm.

- special relativity -
**Count Iblis**, Tuesday, June 7, 2011 at 1:13pmThe total energy of a system is given by:

E = gamma m c^2

The total momentum is:

p = gamma m v

The ratio p/E is thus:

p/E = v/c^2

So, if we know the energy and momentum of a system, we know the velocity.

For the given system, the energy is:

E = E1 + m2 c^2

The momentum is

p = p1

Therefore:

v = c^2 p/E = c^2 p1/(E1 + m2 c^2)

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