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A reference frame is a particular coordinate system chosen to represent physical entities. The notion is most often used in special and general relativity to denote particular coordinates chosen on the spacetime manifold.

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In which frame (with respect to which object) velocity is taken in Bernoulli equation?

I seem to understand your problem. I feel u are having difficulty in understanding how is V = 4/3.Vtrain. If so then it is very simple. See this relationship is achieved by equation of continuity and …
amrit bahl's user avatar