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範例:碰撞瞬間動量守恆與拋體運動

一飛鳥於20m高處以20m/s之速度水平飛行,被一速度為80m/s的子彈鉛直向上擊中,彈留在鳥體內,設飛鳥質量0.75kg,子彈質量0.25kg(g=10 m/s2),則鳥中彈後: (A)中彈瞬間速度大小25m/s (B)經2秒後著地 (C)經4.8秒著地 (D)水平射程72m (E)水平射程98m。【83雄中】

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Posted in 多質點系統的質心運動.

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By admin – 2009 年 01 月 10 日

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