... cos(10 t )(cm) 12 12 C.uM = cos cos(10 t + )(cm) 12 12 A.uM =2cos Trang - 25 - cos(10 t )(cm) 12 12 D.uM = cos(10 t )(cm) B.uM =4 cos Ti liu LT H Vt lý Nm hc 2011- 2 012 Cõu 22: Mt súng ... = 3cm l : A 12( m/s2) B 120 (cm/s2) C 1,20(cm/s2) D 12( cm/s2) Vt dao ng iu hũa theo phng trỡnh : x = 10cos(4t + )cm Bit li ca vt ti thi im t l 6cm, li ca vt ti thi im t = t + 0 ,125 (s) l : A ... s) A2 = x1 + Trang - - Ti liu LT H Vt lý Nm hc 2011- 2 012 Ly = 10, = 3,14 Vn tc ca vt cú li x = 3cm l : A 25 ,12( cm/s) B 25 ,12( cm/s) C 12, 56(cm/s) D 12, 56(cm/s) Mt vt dao ng iu hũa cú phng...