This is the 5168th most frequent Korean word.
놓였다
"놓였다" means "was placed" or "was put."
Here, '놓였다' indicates that the book has been placed, emphasizing the state after the action.
책이 선반 위에 놓였다.
The book was placed on the shelf.
In this case, '놓였다' is used idiomatically to express a mental state of relief by suggesting that a burden has been set down.
그 문제는 이미 해결되고 마음이 놓였다.
That problem has already been solved, and I feel relieved.
Here, '놓였다' refers to the result of arranging or setting something up constructively.