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初速度是v0 vt=v0-at vt=0.5v0解得v0=8m/s vt=4m/s 2秒內的位移s=v0t-0.5at^2=8*2-0.5*2*4=12m 靜止後運動的路程s=v0^2/2a=64/4=16m
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