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如右圖,將質量為100 g的小球自高度為20公尺的A點以18 m/s的初速斜拋出去,落回地面時的速率為20 m/s,求空氣阻力所作的功。
[詳解]
Posted in 重力位能.
Tagged with 功能定理, 地表拋體, 空氣阻力.
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By admin – 2009 年 04 月 15 日
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