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How is the speed of a planet , related t...

How is the speed of a planet , related to the position of the planet ?

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Since angular momentum is a constant.
`(v_(p))/(v_(A))=(r_(A))/(r_(A))` where, `v_(P)` - Speed at the perihelion
`v_(A)` - Speed at the apchelion
`r_(A)` - Distance of the planet at the apehelion
and `r_(A)` - Distance of the planet at the perihelion.
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