4. ( (15 points) A comet is on a straight-line path collision with Blue Star that has an average density of 1.41 g/cm . A planet with negligible mass orbits the Star with a mean orbital distance of 1.52 AU and a period of 1.12 years (1 AU = 1.496 10#1 m). The comet's velocity is 1.57 km/s at 0.91 AU from the Star. (a) What is the acceleration of ration of the comet at 0.22 AU from the Star in m/s?? (b) What is the comet's velocity at 0.22 AU from the Star in km/s? (c) What is the planet's orbital velocity in km/s? (d) What is the escape velocity at the Star's surface in km/s