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有一质点沿x方向作直线运动,质点的运动学方程x=4t+1/3t^2-12决定,其中x的单位是米,t的单位是秒。则质点的加速度为()。

单选题
2021-09-06 21:07
A、α=2/3m/s
B、α=2/3tm/s^2
C、α=2/3m/s^2
D、α=4m/s^2
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正确答案
C

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