sagging ceiling

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Our first floor is sagging in the kitchen area by at least 2" and we have a crack in the ceiling plaster about 6 feet long. I want information on how to go about jacking up the ceiling below to bring back to level. I have jacks but am wondering if they can lift enough to solve the problem and if not what other alternatives are there? I can easily get at the area through my basement and how would I go about shoring up the Joist's.