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Question on Dr Joels Book - Chapter 1

Question asked by VNA123 on Jun 13, 2018
Latest reply on Jun 20, 2018 by Dr_joel

Can you please explain to me why we can define eq 1.8 the way it is? It makes sense to me but only in the way that if you replace v1 with Vf+Vr, it makes equation 1.7 stay true.

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