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Halley's comet, which passes around the Sun every 76 years, hasan elliptical orbit. When closest to the Sun (perihelion) it is ata distance of 8.823 x 1010 m and moves with a speed of54.6 km/s. The greatest distance between Halley's comet and the Sun(aphelion) is 6.152 x 1012 m.
Part A: Is the speed of Halley's comet greater than or less than54.6 km/s when it is at aphelion? Explain.
Part B: Calculate its speed at aphelion.
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