Acceleration Part 3: Is Constant Ga Assumption Valid?

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Homework Statement



Reconsider the assumption made in part 1 regarding the constancy of ga. Briefly comment on the validity of this assumption.


Homework Equations



part 1-

https://www.physicsforums.com/showthread.php?t=161723

The Attempt at a Solution



The equation used is

s=ut+1/2 at2.

This equation is valid when neglecting air resistance. And is valid as there is no air resistance in space.


(is this correct)
 

Discussion

More generally; the equation is valid for constant acceleration (i.e. there exist no external forces) which is the case in space.

(In future, it may be better to contine each question in the same thread!)