Because every body (including you!) has an "escape velocity." Objects have to travel faster than the escape velocity to overcome the gravitational attraction in order to "leave."
The escape velocity of the earth is a little over 11 km/sec.
HTH
Charles
2007-01-21 13:48:38
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answer #1
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answered by Charles 6
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The reason is a substance that they call space time envelops the earth and keeps it constricted into a Ball that we call Globe .The atmosphere is jut another mass being constricted by it. So mass to exist as a volume is required to be constricted.
In order to escape we must have a rocket which has power enough to Breack thru the power that is stored in Space time. The velocity of break thru is called escape velocity. So if something moves slowly it must compensate by being more massive it order to produce the same power.
2007-01-21 14:03:55
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answer #2
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answered by goring 6
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The "escape velocity" is a bit of a misnomer. Yes something could go slower if it had enough fuel to keep pushing and pushing out of the atmosphere. However with our current technology, this simply isn't feasible, so we go fast.
You could conceivably make a rocket that would ascend at 100 mph and just keep on going. But think about how long it would take to 200 miles that way and how much fuel that would require.
Or you could have a space elevator and have the elevator go 100 mph by pushing on the cable.
2007-01-21 13:51:40
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answer #3
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answered by Anonymous
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As an object moves upward relative to Earth's surface, gravity is attempting to pull it back down. The object moving upwards has to move fast enough to counteract gravity.
2007-01-21 15:41:35
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answer #4
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answered by Anonymous
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Air resistance will improve geometrically by way of fact the altitude is way less. maximum meteors deplete over 50 miles extreme. basically the bigger ones make it to the decrease stages of air. greatest ones make it to floor. Many explode earlier that by way of extreme tension on the front and exceedingly much no tension at the back of as they fly at 40,000 to a hundred and fifty,000 mph.
2016-12-16 10:16:59
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answer #5
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answered by ? 4
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