What must be considered when assessing the required effort to initiate a decaying orbit?

Answer

The required change in velocity, or Delta-v ($\Delta v$)

The necessary effort is quantified by Delta-v ($\Delta v$); transitioning to a decaying path requires only a small, precise reduction in velocity, much less than what is needed for a major orbit change.

What must be considered when assessing the required effort to initiate a decaying orbit?

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