According to theory of relativity, mass of any object have two state.
Mass of static object and the mass of dynamic object.
Dynamic objects mass is less than that of static object. With the increasing of motion objects mass tends to decreases.
Mass when object in rest is invariant mass and mass when object in motion is relativistic mass.
Invariant mass is equal to rest energy and relativistic mass is equal to relativistic energy.
Invariant mass is usually preferred over rest energy. The inertia of any object is determined by relativistic mass.
Photon have zero rest mass but have inertia, weight in gravitational field.
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