diff-equation

Question: The differential equation of the family of curves $v=\frac{A}{r}+B,$where A and B are arbitrary constants, is



1) $\frac{{{d}^{2}}v}{d{{r}^{2}}}+\frac{1}{r}\frac{dv}{dr}=0$
2) $\frac{{{d}^{2}}v}{d{{r}^{2}}}-\frac{2}{r}\frac{dv}{dr}=0$
3) $\frac{{{d}^{2}}v}{d{{r}^{2}}}+\frac{2}{r}\frac{dv}{dr}=0$
4) None of these
Solution: Explanation: No Explanation
Formation of differential equations

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