So I know there's a quick rule of thumb equation for calculating the relationship between crater size and energy imparted, but I can't seem to find it. All I can find is the full equation and that one is too cumbersome for me to use it in my head. Does anyone know it, off the top of their head?
It would be invalid either way since there's a variable velocity change depending on if the one being thrown accelerates or decelerates themselves mid-flight.