A white disc speeds up with tangential acceleration a at a distance r from its center. A black disc has a tangential acceleration of 3a at a distance 2r from its center. How does the angular acceleration of the white disc Orwhite compare with the black disc Or black? awhite = 191 09 Oblack Qwhite = 60black OA OB Qwhite OXblack Owhite = -Oblack O c O D