汽车刹车后做匀减速直线运动，其位移与时间的关系是：x＝48t

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汽车刹车后做匀减速直线运动，其位移与时间的关系是：x＝48t－4t²，则它在8 s内行驶的路程等于（）

A．128m

B．144 m

C．256 m

D．288 m

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