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Speed of a planet in an ellioptical orbit with semimajor axis a about sun of mass M at a distance r from sun is

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Speed of a planet in an ellioptical orbit with semimajor axis a about sun of mass M at a distance r from sun is
A. `sqrt(GM((2)/(r)-(1)/(a))`
B. `sqrt(GM((1)/(r)-(1)/(a))`
C. `sqrt(GM((1)/(r)-(2)/(a))`
D. `sqrt((GMr)/(2a^(2))`
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Correct Answer - A
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