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Physics: A planet orbits a distant star in a circular motion, free of all but the...

Physics: A planet orbits a distant star in a circular motion, free of all but the gravitational force. If the star has a mass of 2.055 × 1031 kg and the planet is located 3.5 astronomical units (1 AU = 93.0 million mi, 1 mi = 1.61 km) away from the center of the star, with what speed does this planet travel in km/s? what's  the period of the planet’s orbit?

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