posted by Meisha .
The orbit of Halley's Comet around the Sun is a long thin ellipse. At its aphelion (point farthest from the Sun), the comet is 5.1 1012 m from the Sun and moves with a speed of 12.0 km/s. What is the comet's speed at its perihelion (closest approach to the Sun) where its distance from the Sun is 8.2 1010 m?
use the first set of data to find the constant sqrt (GMs)= r^2 v
vn =sqrt ((ro^2*vo)/rn)