2.5\(cm^3\)
15.5\(cm^3\)
18.7\(cm^3\)
21.4\(cm^3\)
72.5\(cm^3\)
Correct answer is C
\(v_2=\frac{v_1p_1}{p_2}=\frac{20\times700}{750}=18.66=18.7cm^3\)
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