一质点沿X轴作简谐振动,振动动方程为:=4times (10)^-2cos (2pi t+dfrac (1)(2)pi )(S1),从t=0时刻起,到质点位置在x=-2cm处,且向x轴正方向运动的最短时间间隔为 ( )A. 2 B. 3 C. 1 ( A ) D. =4times (10)^-2cos (2pi t+dfrac (1)(2)pi )(S1) E. =4times (10)^-2cos (2pi t+dfrac (1)(2)pi )(S1) ( F. =4times (10)^-2cos (2pi t+dfrac (1)(2)pi )(S1) G. =4times (10)^-2cos (2pi t+dfrac (1)(2)pi )(S1) ( =4times (10)^-2cos (2pi t+dfrac (1)(2)pi )(S1)

一质点沿X轴作简谐振动,振动动方程为:,从t=0时刻起,到质点位置在x=-2cm处,且向x轴正方向运动的最短时间间隔为 ( )

A. 2
B. 3
C. 1 ( A )
D.
E. (
F.
G. (