汽车以大小为20 m/s的速度做匀速直线运动, 刹车后的加速度的大小为5

汽车以大小为20 m/s的速度做匀速直线运动, 刹车后的加速度的大小为5 m/s2,那么刹车后2 s内与刹车后5s内汽车通过的位移大小之比为(  

     A. 45         B. 54         C. 34          D. 43

答案

C

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