30. What is the escape velocity of the rocket in the earth? A.12.2 km/sec B.10.2 km/sec C.13.2 km/sec D.11.2 km/sec
Option C Solution: Saturn is mainly composed of the lightest two gases known, hydrogen and helium. It is the only planet in our solar system whose density is less than water.
Option D Solution: The escape velocity of the rocket in the earth is 11.2 km/sec.
