Translation of "Investigated" in Polish

Researchers have investigated this,

Naukowcy to sprawdzili i okazało się,

John investigated the accident thoroughly.

John starannie badał ten wypadek.

Charles Walcot investigated the magnetic compass bearing sense in pigeons.

Charles Walcot badał poczucie magnetyzmu u gołębi.

- He has investigated the possibility of cooperation.
- He has studied the possibility of a collaboration.

Badał możliwości współpracy.