A rocket is fired fired vertically from the surface of Mars with a speed of 2 `Kms^(-1)`. If `20%` of its initial energy is lost due to martain atmospheric resistance, how far will the rocket go from the surface of Mars before returning to it ? Mass of Mars=`6.4xx10^(23)`Kg, radius of Mars=3395 Km, G=`6.67xx10^(-11)Nm^(2)Kg^(-2)`.