Question

why is mass not an invariant quantity​

Answer 1

Explanation:

hey mate here is ur answer ☺❤❤

The relativistic mass corresponds to the energy, so conservation of energy automatically means that relativistic mass is conserved for any given observer and inertial frame. However, this quantity, like the total energy of a particle, is not invariant.

hope it helps you ☺☺❤❤❤❤

Answer 2

In general , for isolated system and single observers , relativistic mass is concerned but is not invariant . however , this quantity like the total energy of a particle , is not invariant .