1B. Gravity 125%) A comet of mass m undergoes a highly elliptical orbit around the Sun, whose mass is M. At perihelion (closest approach) the distance of the comet from the Sun is rp, and its speed is Vp. At aphelion (when the comet is farthest from the Sun) the distance is r, and the comet’s speed is va (a) Explain, with the aid of a suitable diagram, why remYp = l’unWa. 110%! 110%! o and vp are determined by observing the comet at perihelion. Are you able to predict r, and (c) Suppose a? If so, explain how you would do this. 15% I