Can anyone help

1. (15 points) Eris is a dwarf planet that moves in a very elliptical orbit around our sun. Eris' speed at its closest approach of 5.73 x 10 km is 5.89 km/s. (a) (5 points) How far is Eris from the Sun (in km) at its most distant point, where its speed is 2.75 km/s? (b) (5 points) Determine Eris' orbital period (in Earth years) around the sun. () (5 points) Given that the mass of Eris is 1.65 x 10%* kg and that is radius is 1.16 % 10? km, calculate the acceleration due to gravity at the surface of Eris and the velocity necessary to escape from Eris' surface. Comment on the escape velocity in light of the fact that the muzzle velocity of some rifles can be greater than 1400 m/s