A planet of mass M orbits a star in a circular orbit of radius R, in orbital period T. What would be the orbital period of another planet, orbiting at radius R, but having mass 2M?
A. 0.71T
B. T
C. 1.4T
D. 2T
E. 0.50T
B. T
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1.8 2.4 3.2 4.1 5.12