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    Question

    What is the minimum escape velocity of rocket to be

    launched into space?
    A 5 Km/Sec. Correct Answer Incorrect Answer
    B 6 Km/Sec. Correct Answer Incorrect Answer
    C 11 Km/Sec. Correct Answer Incorrect Answer
    D 15 Km/Sec. Correct Answer Incorrect Answer

    Solution

    On the surface of the Earth, the escape velocity is about 11.2 kilometers per second 06.96 mi/s), which is approximately 34 times the speedof sound(Mach34) andseveral timesthemuzzlevelocity ofarifle bullet (up to 1.7 km/s). However, at 9,000 km altitude in "space", it is slightly less than 7.1 km/s. In physics,escapevelocityisthespeedatwhichthe kinetic energy plus the gravitational potential energy of an object is zero.

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