I have read somewhere that when an object is approaching the speed of light then its relative mass is increasing by the formula $m=\frac{m_0}{\sqrt{1-(\frac{u}{c})^2}}$. Is this true? If yes then why this happens? Does an object really increase its mass when it has bigger velocity or it has to do with the mommentum? I am confused.If here on earth we measure 1 kg and then accelerate it at $u=c/2$ then its mass will be bigger?
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