How fast does a rocket have to travel to brake Earth's gravity?
by 
Mario Bonaminio
ANSWERS: 1
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The concept of escape velocity is treated under "Science/Physics/Gravity". See http://www.answerbag.com/a_view.php/8361 for a general treatment of orbit and escape. A rough estimate for an object at the Earth's surface is 7 miles/second (11km/s). Initial velocity will be lower with higher altitude. (I assume "brake" ought to be "break" as in "break free of") Also, an object is theoretically never "free" of earths gravity, but it can be distant enough to be insignificant and or moving fast enough away never to fall back.
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