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範例:平面運動的獨立性

一運動物體之位置向量與時間之關係為r=2t2 i +9t j,則此物體 (A)作變加速度運動 (B)3秒末的速度大小 15m/s (C)3秒內平均速度大小 (D)Y方向無加速度 (E)軌跡方程式為y=27x


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