If the escape velocity on earth is 11.2 km/s, its value for a planet having double the radius…

Q: If the escape velocity on earth is 11.2 km/s, its value for a planet having double the radius and 8 times the mass of earth is..(in km/sec)

(a) 11.2

(b) 22.4

(c) 5.6

(d) 8

Ans: (b)