$\begin{array}{1 1}(A)\;\large\frac{v_1+v_2}{2} \\(B)\;\large\frac{2v_1v_2}{v_1+v_2}\\(C)\;\sqrt{v_1v_2}\\(D)\;\sqrt {\large\frac{v_2}{v_1}} \end{array} $

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