Geography perihelion aphelion उपसौर और अपसौर

During motion of a planet from perihelion to aphelion the work done by gravitational force of sun on it is

A comet moves in an elliptical orbit with an eccentricity of e = 0.20 around a star. The distance between the perihelion and the aphelion is 1.0 xx 10^(8) km. If the speed of the comet at perihelion is 81 km/s, then speed of the comet at the aphelion is :

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