why don't you just admit that you are Yoon himself, instead of
constantly using the referral 'according to Dr. Yoon'... it wil sure
save a lot of typing for you. and stop the silly newedana says,
newadana crap thing...

and what is M? be clear when you write something. and hey stupid, why
must i take v/c neglible? the equation E=mc^2 holds for a mass at any
speed, not only when vc. it is an exact relation.... go back to
Halliday & Resnick (a proper textbook!) .....