基測前!國中理化問題:化學平衡、直線運動 - 運動
By Lauren
at 2010-07-05T00:00
at 2010-07-05T00:00
Table of Contents
麻煩各位高手解題星期六、日就要基測了~~很急很急!!1、一物體在30牛頓的推力作用下,以15m/s在水平桌面上作等速度運動,如果想要使物體以30m/s的速度在同一水平面上作等速度運動,則所需推力?A 30牛頓B 45牛頓C 60牛頓D 90牛頓 答案: A *【我想問】:等速度合力為零,可��
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運動
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