If a mass m0 is greater in normal. When the mass is for reference frame moving with speed to be as one of the light speed khrueng. How to measure the amount of mass.
If m0 is the mass in normal conditions. When the mass is in reference frames moving at a speed of one half of the speed of light. How much mass to be measured.
If M0 was the mass in normal condition. When the mass is in the frame of reference, which is one of the fast moving at the speed of light in the mass number is measured.