Question

According to the theory of relativity, mass
of a body is :​

Answer 1

Answer:

Relativistic mass, in the special theory of relativity, the mass that is assigned to a body in motion. ... The relativistic mass m becomes infinite as the velocity of the body approaches the speed of light, so, even if large momentum and energy are arbitrarily supplied to a body, its velocity always remains less than c.

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Answer 2

Answer:

Einstein's redescription does away with that coincidence and even the very idea of distinct inertial and gravitational masses. In his theory, bodies now just have mass, or, in the light of special relativity, mass-energy.

Explanation:

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Answer from Pranav Sai