DISCOVERED FO'S AIRSPEED UNRELIABLE AT V1. FLT CONTINUED TO DESTINATION.

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TKOF ACCELERATION CORRESPONDINGLY RAPID. RWY 28 USED. TKOF ROLL NORMAL AND ALL 3 AIRSPD INDICATORS CHKED AT 100 KIAS. AT V1 ON CAPT'S SIDE (CAPT'S TKOF) THE F/O'S INDICATOR READ APPROX 10 KTS LOW. STANDBY AIRSPD INDICATOR CHKED AND GND SPD INDICATOR CHKED. DUE TO RAPID ACCELERATION; TKOF CONTINUED USING ALL CAPT'S INFO. BY THIS TIME IT WAS OBVIOUS THE F/O'S AIRSPD INDICATOR WAS UNRELIABLE (FLUCTUATING AIRSPD; SLOW BUILD UP; INTERMITTENT FLAGS; ETC). AT APPROX 1000' F/O'S STATIC SELECTOR SWITCHED TO ALTERNATE. NO CHANGE AND RETURNED TO NORMAL. NO CHANGES. VHF/NAV SWITCHES ALL SELECTED TO BOTH LEFT; NO CHANGE; THEN RETURNED TO NORMAL; NO CHANGE. AT 3000' I QUERIED ATC AND THEIR GND SPD READOUT AGREED WITH THE INFO ON MY (CAPT'S) SIDE. I RECHKED ENRTE AND TERMINAL WX RPTS AND THEY INDICATED THAT THE ENRTE AND TERMINAL WX PRESENTED NO OBSTACLE TO SUCCESSFUL FLT. THE CAPT'S STANDBY STATIC SOURCE-CHKED OK. CB TESTS INDICATED THAT THE #2 CADC APPEARED TO BE THE CULPRIT. I DECIDED TO CONTINUE THE FLT. PERIODIC CHKS WITH ATC CONFIRMED THAT THE CAPT'S AIRSPD INDICATORS WERE FUNCTIONING PROPERLY. THE FLT TO JAN WAS ROUTINE AND UNEVENTFUL.