Ok. enough of the flailing of pointy things. ow note to self: don't carry out all practical explanations of things on this board
I'm not interested in surface area. it brings in whole realms of strange and mystic equations.
two identical objects; travel thru space with dissimilar speeds; impact on eachother at the same surface area.
does the speed of one directly translate into the damage of the other or is it all shared?

Picture this. A journey of sight and sound. there are two cubes of same size etc. from the viewpoint of one, the other is hurtling toward it at a treeemeeedooouuusss rate; and vice versa. Without any equations you could safely say that the damage should be shared equally.