题目

甲、乙两物体同时从同一地点沿同一方向做直线运动的速度时间图象如图所示，则在前6s关于两车的运动，下列说法正确的是（                                                                   ）                                                                                                                                       　   A．  两物体两次相遇的时刻是2s和6s 　   B．  4s时甲在乙后面 　   C．  两物体相距最远的时刻是1s末 　   D．  乙物体先向前运动2s，随后向后运动                                                                                                                                          答案：AB

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