The escape velocity from the surface of Earth is $v_e = 11.2\text{ km/s}$. For another planet having twice the radius and the same mean density as Earth, the escape velocity would be:
- A$22.4\text{ km/s}$
- B$11.2\text{ km/s}$
- C$15.8\text{ km/s}$
- D$5.6\text{ km/s}$