单选题:一个质点做简谐运动,其位移2与时间t的关系曲线如图6—13所示,在t=4 S时,对质点运动状况,下面几种判断正确的是.

题目内容:
一个质点做简谐运动,其位移2与时间t的关系曲线如图6—13所示,在t=4 S时,对质点运动状况,下面几种判断正确的是. (  )
A.速度为正的最大值,加速度为零
B.速度为负的最大值,加速度为零
C.速度为零,加速度为正的最大值
D.速度为零,加速度为负的最大值

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