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12). A planet of mass 34,000 kg is orbiting around the Sun in a circular path...

12). A planet of mass 34,000 kg is orbiting around the Sun in a circular path so that it currently is 2x10^11 m from the Sun and traveling at 20 km/s. Six months later, the planet is 0.6x10^11 m from the Sun. If we assume angular momentum is conserved, how fast is it orbiting?

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