Word Count : 257

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To find the speed of a comet at perihelion and aphelion, we use the law of conservation of angular momentum and vis-viva equation from elementary mechanics. Let the perihelion distance be ( r_p ) and aphelion distance ( r_a ), with the Sun’s mass ( M ). The comet’s velocity ( ____ ____ _________ ___ ________ _____ ______.
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