CABIN ATTENDANT OF A DC9 INJURED AND ACFT CABIN DAMAGED DURING SEVERE TURB.

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FOLLOWING A NORMAL TKOF AND CLB; WE WERE CLRED TO FL290 DIRECT ROCHESTER; MN; ON COURSE. DURING CLB; WE ENCOUNTERED LIGHT TURB. ATC ADVISED US THAT MOSTLY LIGHT AND OCCASIONAL MODERATE WAS RPTED AT ALL ALTS. THIS WAS ALSO STATED IN OUR RELEASE PAPERWORK. AT 109 MI WNW OF JVL (114.3); WE EXPERIENCED SEVERE TURB. WE IMMEDIATELY REQUESTED A LOWER ALT AND WE WERE EXPERIENCING SEVERE TURB. WE WERE TOLD TO STANDBY. I CAME BACK ON THE RADIO AND SAID WE WERE LEAVING FL290 AND ATC REPLIED 'DSND TO FL210.' AUTOPLT WAS IMMEDIATELY DISCONNECTED; AND I TOLD THE FLT ATTENDANTS TO TAKE THEIR SEATS. THE PA WAS MADE JUST MINS PRIOR; BRIEFING PAX OF POSSIBLE TURB AND TO REMAIN SEATED WITH SEATBELTS ON. WE DSNDED THE ACFT. THE ACFT WAS DIFFICULT TO CTL. WE REQUESTED A BLOCK ALT -- WE DIDN'T THINK WE WOULD BE ABLE TO LEVEL OFF AT A SPECIFIC ALT. AT FL210; THE RIDE WAS SMOOTH AND WE WERE RECLRED TO FL190. ONCE IN SMOOTH AIR; I WENT TO THE CABIN TO CHK ON PAX; FLT ATTENDANTS AND CONDITION OF CABIN. PAX WERE ALL GOOD; FLT ATTENDANTS WERE NOT ABLE TO MAKE IT TO THEIR SEATS. THE LEAD WAS IN FIRST CLASS AND HELD BY A PAX AND THE AFT FLT ATTENDANT WAS THROWN AROUND AS WAS HER GALLEY CART. WHEN I WENT BACK TO THE REAR OF THE ACFT I FOUND OUT THE GALLEY CART HAD FLIPPED AROUND AND STRUCK THE CEILING. IN DOING SO; IT SMASHED OVERHEAD LIGHTS. THERE WAS POP AND BEER AND BROKEN GLASS EVERYWHERE. ASKING IF SHE WAS OK; SHE SAID SHE HIT THE CEILING ALSO; SHE WAS SORE BUT OK. I HELPED HER CLEAN UP A LITTLE SO THE EMER EXIT COULD BE USED IF NEEDED. AS NO INJURIES WERE APPARENT TO EITHER PAX OR CREW; WE CONTINUED TO ORD WHERE A LNDG WAS MADE UNEVENTFULLY. A LOGBOOK WRITE-UP WAS MADE DESCRIBING THE EVENT. ALSO DURING DSCNT; THE CARGO SMOKE/FIRE DETECTOR WENT OFF; THEN WENT OUT. WE SUSPECTED BAGS HITTING THE SENSORS IN THE CEILING. AS THIS HAPPENS AT TIMES WHEN THEY LOAD BAGS AT THE GATE; NO EMER WAS MADE BECAUSE WE RECEIVED AN ALT CHANGE AS NEEDED AND THERE WERE NO INJURIES TO PAX OR CREW AND NO ABNORMAL OR CTLABILITY PROBS WITH THE ACFT.