1. THI CHT LNG NM 2012-2013 CHC 1/10/2012 CC EM HC TP TT thi ln II-Phy B GIO DC V O TO THI CHT LNG U HC K I NM 2012 www.facebook.com/DienDanBoxMath Mn L; Khi A v Khi A1 thi chnh thc Thi gian lm bi: 90 pht, khng k thi gian pht ( thi 36 cu / 5 trang) M thi 372H v tn:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S bo danh: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3008 CU 2. Mt vt tham gia ng thi 2 dao ng iu ho cng phng cng tn s v ng pha. Nu chtham gia dao ng th nht, vt t vn tc cc i v1 . Nu ch tham gia dao ng th 2, vt t vn tccc i v2 . Khi tham gia ng thi 2 dao ng, vt t c vn tc cc i l?A. V = 3v1 + 2v2 . B. V = v1 + v2 . C. V = v1 v2 . D. V = 2v1 +3v2 .3008