Ive Heard that things can get mass when moving in speeds Close to c. So I have question. Lets say we have to objects, Object A and Object B. Object A has twice the size of Object B. Lets say these two objects where moving close to the speed of light. But Object B, who is twice as Little, moves a Little bit "faster". If I would measure these objects "mass", would it be possible for them to have equal mass? Object A is bigger, but not moving as fast as object B.