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A comet of mass m is observed to have a speed v when it is at a distance r from the Sun, and its direction

A comet of mass "m" is observed to have a speed "v" when it is at a distance "r" from the Sun, and its direction of motion makes an angle with the radius vector from the Sun. Take the mass of the Sun as "M." What is its total energy, "E"? What is the eccentricity of its orbit?

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