Two exoplanets, Kepler-186f and Kepler-186g, orbit their host star in stable circular orbits. The orbital radius of Kepler-186g is 2.25 times the orbital radius of Kepler-186f.
What is the ratio of the orbital speed of Kepler-186f to the orbital speed of Kepler-186g, vfvg\displaystyle \frac{v_{\text{f}}}{v_{\text{g}}}vgvf?
0.670.670.67
1.501.501.50
2.252.252.25
3.383.383.38