A comet is in an elliptical orbit around the Sun. Its closest approach to the Sun is a distance of 5 multiply 1010 m (inside the orbit of Mercury), at which point its speed is 9.1 multiply 104 m/s. Its farthest distance from the Sun is far beyond the orbit of Pluto. What is its speed when it is 6 multiply 1012 m from the Sun? (This is the approximate distance of Pluto from the Sun.) speed = m/s

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.