Question

Halley's comet moves about the Sun in a highly elliptical orbit. At its closest approach, it is a distance of 8.90 1010 m from the Sun and has a speed of 54 km/s. When it is farthest from the Sun, the two are separated by 5.30 1012 m. Find the comet's speed at that point in its orbit.

Answers

Alex
Nevermind figured it out, just have to use m1v1=m2v2.
Elena
v² =G•M/R²
(v1/v2)²=R2/R1,
v2=v1•sqrt(R1/R2)

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