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In my world, when confronted with an ill-posed question, the crucial
first step is to clearly identify it as ill-posed.
We agree.
I also remark that in most cases other than (a), any observer with
the slightest amount of sense would have noticed that the gravitational
acceleration was time-dependent, and would report the time-dependence
explicitly (rather than merely quoting the instantaneous value).
Now THAT is a seriously good point!