QuestionA satellite of mass $m$ is launched vertically from the surface of a planet with no atmosphere. The planet has mass $4 M_{E}$ and radius $2 R_{E}$, where $M_{E}$ and $R_{E}$ are the mass and radius of Earth, respectively. What is the minimum launch speed necessary for the satellite to escape the gravitational force exerted by the planet? (A) $2 \sqrt{\frac{G M_{E}}{R_{E}}}$ (B) $\frac{\sqrt{2 G M_{E}}}{R_{E}}$ (C) $2 \sqrt{\frac{G m}{R_{E}}}$ (D) $\frac{\sqrt{2 G m}}{R_{E}}$