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*gravitational mass*and

*inertial mass*is

*. This principle is known as the principle of equivalence. However, I heard that in Relativity,*

**m***gravitational mass*is

*instead of*

**γm***because total energy of the particle is*

**m***But in special relativity, it is widely known that*

**γmc**^{2}.*while*

**F=γ**^{3}ma**is acceleration. Does that means**

*a**inertial mass*and

*gravitational mass*is different in general and only approximately same at non-relativistic situation? Or is

*inertial mass*also

**? Or is the answer totally different?**

*γm*