题目

如图为某质点做简谐运动的图象，则由图线可知（        ）                                                                                                                                              　   A．  t=1.5s时，质点的速度和加速度都与t=0.5s时等大反向 　   B．  t=2.5s时，质点的速度与加速度同向 　   C．  t=3.5s时，质点正处在动能向势能转化的过程之中 　   D．  t=0.1s和t=2.1s时质点受到相同的回复力                                                                                                                                         答案：BC

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