A) Use the following data to calculate the speed vp of comet Halley at perihelion. Comet Halley orbits the Sun with a period of 76 years and in 1986 had a distance of closest approach of 8.90×1010 m and an aphelion distance of 5.30×1012 m.
B) Calculate of the speed va of comet Halley at aphelion.
C) Using conservation of angular momentum relative to the Sun, find the ratio of the comet's perihelion distance Rp to its aphelion distance Ra from the values of vp and va.