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The presented letters covers an almost year-long discussion of the author anda Very Qualified scientist, VQS, about the dependence of mass upon speed ifrelativistic corrections are taken into account. VQS believes that since massis a scalar, it cannot depend upon speed and has to be the same in all inertialcoordinate frames. In his view, the very idea of speed dependence of the massof a particle or a body is incorrect and misleading. As such, the notion ofspeed dependence of a particle mass has to be eliminated from textbooks onphysics and from teaching of this subject. The author claims that this notionhas the right to exist, is easily understandable and convenient for most of thestudents, both non physicists and even physicist. His view is that it isnothing wrong in expressions like particle mass increases with the growth ofspeed. His view upon the debate is that both approaches are equally correct.His view is that the dilemma depends or not depends is a matter of taste andconvenience, not of scientific importance and unavoidable scientific rigor.Upon request of VQS, M. Amusia has commented the manuscript of academician L.B. Okun resent book ABC of physics. The comments are included into this lettersexchange.

Does the body mass depend upon its speed. Discussion via exchange of letters