Acomet is in an elliptical orbit around the sun. its closest approach to the sun is a distance of 4.7 × 10^10 m (inside the orbit of mercury), at which point its speed is 9.3 × 10^4 m/s. its farthest distance from the sun is far beyond the orbit of pluto. what is its speed when it is 6 × 10^12 m from the sun? (this is the approximate distance of pluto from the sun.)