mass as well as velocity - i.e. energy.
what?
...
In full context, what I wrote was "If you have a particular bullet and want to insist its velocity matters, only then are you correct because you are also talking about a particular mass as well as velocity - i.e. energy."
Energy = 1/2 * m * v * v
I would also add that for a particular mass and velocity, momentum is also a known quantity.
