What is the minimum escape velocity of rocket to be launched into space?

(A) 5 Km/Sec.
(B) 6 Km/Sec.
(C) 11 Km/Sec.
(D) 15 Km/Sec.

Correct Answer : 11 Km/Sec.
Question Asked : SSC Section Officer (Audit) Exam 1997
Explanation : In physics, escape velocity is the speed at which the kinetic energy plus the gravitational potential energy of an object is zero. It is the speed needed to "break free" from a gravitational field without further propulsion. On the surface of the Earth, the escape velocity is about 11.2 kilometers per second (– 6.96 m/s), which is approximately 34 times the speed of sound (Mach 34). However, at 9,000 km altitude in "space", it is slightly less than 7.1 km/s.
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