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A planet moves around the sun. At a given point P,it is closet from the sun at a distance $d_1$ and speed $v_1$ At another point Q when it is farthest from the sun at a distance $d_2$, its speed will be

$a)\;\large\frac{d_1^2v_1}{{d_2}^2} \\ b) \; \large\frac{d_2v_1}{d_2} \\ c) \;\large\frac{d_1v_1}{d_2}\\ d) \large\frac{{d_2}^2 v_1}{{d_1}^2}$

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1 Answer

Angular momentum of the planet remains constant
Hence b is the correct answer.
answered Aug 9, 2013 by meena.p
edited Apr 1, 2014 by meena.p

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