速率的基本公式是？, 距離×時間, 距離−時間, 距離/時間, 時間+距離, 速率的常用單位是？, m², L, kg, m/s, 跑 100 m 用 20 s，速率是多少？, 2 m/s, 10 m/s, 20 m/s, 5 m/s, 同路程下，時間越短，速率如何？, 越小, 不變, 越大, 無法判斷, 同時間下，路程越長，速率如何？, 越大, 無法判斷, 不變, 越小, 平均速率的定義是？, 最大速率, 總路程/總時間, 路程×時間, 總時間/總路程, 速率為 0 代表？, 減速, 靜止, 轉向, 加速.
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