What definable Units does Massenergy have?

Question

Mass has the dimensions of kilogram in dimensional analysis.;
Energy has the Units of Kilograms times velocity squared =are those dimensions a product of each other?

Answer 1

So first off... massenergy... is an awkward word to use.

Mass is kg, yes.

Now think about the equation for kinetic Energy: 1/2 m*v^2

The 1/2 aside, it's basically just mass, times velocity squared.

Einstein's equation for rest energy?

E = mc^2, where C is a velocity as well.

To clump the two together and call it Massenergy... doesn't really ... do much for you.

I mean sure if you're doing something like finding the conserved values during relativistic reference frame changes, multiplying mass by energy might be something fun to try.. and in that case, yes you could just make it a product of each other, Massenergy would be mass^2 * velocity ^2. But really, just remember the definitions for mass and energy separately should be fine.