物体处在运动正方向的端点时，速度和加速度都达到最大值；

(B) 物体位于平衡位置且向负方向运动时，速度和加速度都为零；

(C) 物体位于平衡位置且向正方向运动时，速度最大，加速度为零；

(D) 物体处在负方向的端点时，速度最大，加速度为零。

-Objects in the direction of movement is the endpoint, the velocity and acceleration have reached the maximum　(B) the location of objects located in the balance and movement to the negative direction, velocity and acceleration are zero　(C) the location of objects located in the balance and to the positive direction campaign, the maximum speed, acceleration is zero　(D) objects in the negative direction of the endpoint, the maximum speed, acceleration is zero.