Description for particles in an attractive 1/r potential show that  a) if 2 orbits have the same ...

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Description for particles in an attractive 1/r potential show that  a) if 2 orbits have the same angular momentum , the perihelion of the parabolic orbit is one half the radius of the circular orbit b) the speed of a particle at any point in a parabolic orbit is (root 2) faster than the speed of a particle in a circular orbit passing through the same point