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车辆位置: s(t) = 10t^3 - 30t^2 + 5 (米)。计算 v(t) 、、 并确定何时加速度为零。
车辆位置: s(t) = 10t^3 - 30t^2 + 5 (米)。计算 v(t) 、、 并确定何时加速度为零。
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