This is a question about the relativistic mass concept which I am having trouble understanding, mainly because of the scenario below.
Suppose 1 gram of matter is accelerated to 99% the speed of light. At this speed, the relativistic mass is 7 times greater than the rest mass. If this matter collides with a stationary quantity of 7 grams of antimatter, will the two masses annihilate completely with each other? Or will the matter just annihilate 1 grams worth of antimatter?
If the latter is true then what exactly am I overlooking about the relativistic mass concept that makes the former incorrect?