Halleys comet which passes around the sun every 76 years, Physics

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Halleys comet which passes around the sun every 76 years

Halleys comet, which passes around the sun every 76 years, has an elliptical orbit. When closest to the sun (perihelion) it is a distance of 8.823 x 10^10m and moves with a speed of 54.6km/s. the greatest distance between haloes comet and the sun (aphelion) is 6.152 x 10^12m.

(a) is the speed of halleys comet greater than or less than 54.6 km/s when it is at aphelion? explain.

(b) calculate its speed at aphelion.

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