A B747-400 FO MAKES A HARD LNDG AT DEN; CO. PAX AND FLT ATTENDANT INJURIES.

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FO WAS FLYING. WX WAS VFR WITH LLWS ADVISORIES IN EFFECT AS THERE HAD BEEN PREVIOUS TSTM ACTIVITY IN THE AREA. ON FINAL APCH TO RWY 16 IN DEN; THE APCH WAS VERY NORMAL (FLAPS 30 DEGS; REF SPD 136 KIAS; TARGET SPD 141 KIAS); WHEN A B737 IN FRONT OF US RPTED A 20 KT LOSS AT 100 FT OVER THE RWY. I TOLD XX TO MAKE OUR TARGET SPD 150 KIAS; THEN UPPED IT TO 155 KIAS -- ABOUT 2 MI OUT. ACFT WAS ON PROFILE AND STABILIZED. AS WE APCHED THE THRESHOLD; THE AIRSPD INCREASED TO APPROX 170 KTS. THEN; AT THE 50 FT CALLOUT; THE ACFT SEEMED TO JUST DROP; CONSEQUENTLY; LNDG MUCH HARDER THAN ANTICIPATED. AT THE TIME OF TOUCHDOWN; THE WINDSHEAR ALERT SYS ACTIVATED IN THE COCKPIT. AFTER TOUCHDOWN; I IMMEDIATELY GRABBED THE CTLS TO KEEP THE ACFT ON THE GND AND ON THE RWY. 3 FLT ATTENDANTS AND 2 CUSTOMERS WERE INJURED AND ESCORTED TO THE HOSPITAL FOR A CHK-UP. BECAUSE SOME PANELS CAME DOWN IN THE CABIN; MAINT DID A 2 HR INSPECTION AND FOUND THE ACFT TO BE AIRWORTHY. FERRIED ACFT TO CHICAGO. SUPPLEMENTAL INFO FROM ACN 440710: I HAND FLEW THE APCH. IT WAS SMOOTH AND STABILIZED. AS WE APCHED THE THRESHOLD; I DISCONNECTED THE AUTOTHROTTLES; AND AT THE MOMENT I DID SO; THE AIRPLANE WAS ON SPD AND ON PROFILE. AT THE GPWS 50 FT CALL; JUST AS I WAS BEGINNING THE FLARE AND BRINGING THE PWR BACK AND AS I WAS TRANSITIONING MY VISUAL ATTN DOWN THE RWY; I PERCEIVED THAT THE HEADWIND COMPONENT WAS INCREASING. I STABILIZED MY PITCH TO AVOID FLOATING IN THE FLARE. THEN IT SEEMED LIKE THE HEADWIND ABRUPTLY DISSIPATED AND THE AIRPLANE DROPPED TO THE RWY.