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解;6.25=(10-a)*t-1/2at平方t=1的a=2.5 因為6*2.5=15m/s大於10m/s所以4S後就已經停下 S=10t-1/2at平方t=4s s=20m 因為殺車到速度為0後不會再有减速度…車靜止 是各老套的陷阱題
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