Question

The escape velocity on the surface of the earth is 11.2 km/s. If mass and radius of a planet are 4 and 2 times respectively than that of earth, the escape velocity from the planet will be–

• A. 11.2 km/s
• B. 1.112 km/s
• C. 15.8 km/s
• D. 22.4 km/s

Answer 1

Answer: (C)

15.8 km/s

Answer 2

v_e = Ž =

Ž $\sqrt { 2 }$v_e