小曹在地面上以10N 的水平力拉5Kgw的行李，行李箱以5m/s等速前進20秒後停止施力。小曹在這段時間施力所作的平均功率為多少？(A)1000J (B)500J (C)50w (D)25w。

問題詳情

8.小曹在地面上以10N 的水平力拉5Kgw的行李，行李箱以5m/s等速前進20秒後停止施力。小曹在這段時間施力所作的平均功率為多少？
(A)1000J
(B)500J
(C)50w
(D)25w。

參考答案

無參考答案

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