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A planet is in an elliptical orbit around a distant star. At periastron (the point of closest approach to the star), the planet is rp = 4.30×108 km from the star and is moving with a speed of vp = 18.5 km/s. When the planet is at apastron (the point of greatest distance from the star), it is ra = 8.70×108 km from the star. How fast is the planet moving at apastron? va = km/s

A planet is in an elliptical orbit around a distant star. At periastron (the point of closest approach to the star), the planet is rp = 4.30×108 km from the star and is moving with a speed of vp = 18.5 km/s. When the planet is at apastron (the point of greatest distance from the star), it is ra = 8.70×108 km from the star. How fast is the planet moving at apastron? va = km/s

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A planet is in an elliptical orbit around a distant star. At periastron (the point of closest approach to the star), the planet is r p = 4.30 × 10 8 k m from the star and is moving with a speed of v p = 18.5 k m / s . When the planet is at apastron (the point of greatest distance from the star), it is r a = 8.70 × 10 8 k m from the star.
How fast is the planet moving at apastron?
v a = ◻ k m / s

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