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速率是物體運動的快慢,即速率是速度的大小或等價於路程的變化率.在初中物理中被稱為速度,但應與高中物理中的速度加以區別.它是運動物體經過的路程△S和通過這一路程所用時間△t的比值.即(S1-S0)/(t1-t0)
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