Medium
$A$ planet revolves around the sun in an elliptical orbit. When it is closest to the sun,its distance from the sun is $d_1$ and its velocity is $v_1$. When it is farthest from the sun,its distance from the sun is $d_2$ and its velocity is $v_2$. Find the value of $v_2$.
- A$\frac{d_1^2 v_1}{d_2^2}$
- B$\frac{d_2 v_1}{d_1}$
- C$\frac{d_1 v_1}{d_2}$
- D$\frac{d_2^2 v_1}{d_1^2}$
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