在一条宽马路上某处有A、B两车,它们同时开始运动,取开始时刻为

在一条宽马路上某处有AB两车,它们同时开始运动,取开始时刻为计时零点,它们的运动图象如图所示,那么在0t4时间内的情景是(  )

AA车在0t1时间内做加速直线运动,在t1时刻改变运动方向

B.在t2时刻A车速度为零,然后反向运动,此时两车相距最远

C.在t4时刻,A车追上B

D.在t4时刻,两车相距最远

答案

解析:由图可知,A车在0t2时间内向规定的负方向运动,选项A象错误;0t2时间内AB两车背向运动,它们的距离越来越大,t2t4时间内A车追赶B车,它们间的距离仍然越来越大,在t4时刻二者速度相等,此时AB两车距离最大,选项BC错误,D正确.

答案:D

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