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    Question

    What is the escape velocity from

    Earth?  
    A 7.9 km/s Correct Answer Incorrect Answer
    B 11.2 km/s Correct Answer Incorrect Answer
    C 8.5 km/s Correct Answer Incorrect Answer
    D 5.6 km/s Correct Answer Incorrect Answer

    Solution

    Escape velocity is the minimum speed needed to leave Earth’s gravitational field.   It is 11.2 km/s, regardless of mass of object.   This concept is vital in space missions.   Depends on mass and radius of the planet.

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