An asteroid has a mass of 3 × 1020 kg and an escape velocity of 400 m s-1. What is the order of magnitude of the radius of the asteroid?
104 m10^4\text{ m}104 m
105 m10^5\text{ m}105 m
106 m10^6\text{ m}106 m
107 m10^7\text{ m}107 m
