Loosedhorse
member
It doesn't have to.I'm not sure that disproves the statement.
"Impossibility" is a very high standard. We may (if we are generous) have a presumption that an expert saying "impossible" is correct. However, I would think that the provided examples (not hard to find) are enough to shift the presumption to "maybe it actually IS possible, even if improbable."
As I said, impossible is an extreme claim; it means it could never happen, under no circumstances, no matter how improbable. Ever. If someone is claiming that, the burden should be on them to prove, not on others to disprove (IMHO).
It's a poorly written statement.
That seems the most likely option.I wonder if the author meant that a projectile that has only enough energy to penetrate one inch of flesh (or gel) does not have enough energy to deform the lead and copper and thereby expand.