Once a booster get to 70,000M and is travelling at 7700km/hr how fast does the 2nd stage need to accelerate to achieve orbit?

Nov 18, 2020
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Once a booster get to 70,000M and is travelling at 7700km/hr how fast does the 2nd stage need to accelerate to achieve orbit at?
 
The goal of any launch is to reach orbital velocity, roughly 18,000 mph, though less for higher orbits.

A 2nd stage greatly helps get this speed, requiring less fuel.
 
Nov 18, 2020
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Sorry the question wasn't clear.

How quickly does the second stage need to accelerate to achieve orbit? Is there a minimum acceleration they need to achieve to prevent re-entry.?
 
Sorry the question wasn't clear.

How quickly does the second stage need to accelerate to achieve orbit? Is there a minimum acceleration they need to achieve to prevent re-entry.?
The rate of acceleration is an engineering balancing act. They must weigh all the variables as necessary to get to that velocity.

A very high acceleration, for instance, will use less fuel but can cause more damage and may require special engines, etc.
 

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