The relativistic mass of the moving at some velocity body can be expressed as:
where v - the velocity of the body and m0 - the mass of the non-moving body;
We can actually express m0 via NA number:
Now, it is clear that if the body moves at the speed close to the speed of light, then its mass M is going to be closer and closer to the infinity. And this requires an infinite amount of energy. Thus, actually, it is not possible for the body with a non-zero rest mass to move with speed of light.
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