If the length of the spring is the same at T1 and T2, then it is certain that the oscillator will vibrate at these two moments () A. Equal displacement and opposite direction B. equal velocity and same direction C. equal acceleration and same direction D. equal velocity and opposite direction

If the length of the spring is the same at T1 and T2, then it is certain that the oscillator will vibrate at these two moments () A. Equal displacement and opposite direction B. equal velocity and same direction C. equal acceleration and same direction D. equal velocity and opposite direction

A. The spring vibrator vibrates harmonically on a smooth horizontal plane, and the spring length is the same at T1 and T2, which indicates that the displacement and direction of the vibrator passing through the same position are the same, so a is wrong. B, D and velocity are the same, but the direction is not necessarily the same, so BD is wrong. C and vibrator passing through the same position, the displacement and direction are the same, according to a = - kxm The magnitude and direction of acceleration are the same, so C is correct