There is a question asked a few days ago on "Reaching 50% the speed of light using a centrifuge" that is effectively answered by a very nice answer to a different question on "Does a spinning disk weigh more than when it is stationary?". The person who provided the nice answer, @PM-2Ring, notes this in a comment on the first question. Since comments are officially transitory and often not read by subsequent readers of a question, I think would be nice to have a permanent visible answer.
The first question has now been closed as a duplicate, with the duplicate target being a third question "How is length contraction on rigid bodies possible in special relativity since definition of rigid body states they are not deformable?" whose answers don't seem relevant to me, and all three questions seem distinct to me. For example, the answer to the first question might depend on how strictly one defines "centrifuge", e.g. does a Black Hole accretion disk or a cyclotron count? The second question could have been answered without answering the first. The third question and its answers seem to be about linear, not rotational, motion and require some expertise to apply to the first question.
I have noticed other cases where questions are closed as duplicates because another distinct question has the answer buried in its answers. When I look at that question and its answers it can take me some time to find the relevant component. Sometimes I can only recognize that it is relevant because I am an expert, which is unlikely to be the case for the person who asked the original question.
What should the protocol be when a second question is not a duplicate but has the answer to the first question somewhere in its answers. Should we ask the user who gave the relevant answer to mostly copy their answer over to the first question? (This would seem to be okay according to the answers to "Is it OK to copy and paste part of own answer over and over, to answer new questions?".) Or should the first question be closed as a duplicate but give specific directions to the relevant answers?