用 的水平力沿力的方向把物体推动 ,用时 ,则推力做功的平均功率为:
Answer and explanation
Correct answer: C.
其他选项为什么不对: 代入检验,、、都与算出的 不符。
- Step 1: 推力做的功 。
- Step 2: 平均功率 。
Answer
.
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Correct answer: C.
Free questions with an explanation for every one, and full timed Gaokao mock tests.