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銆€銆€m1v1+m2v2=m1v1鈥�+m2v2鈥�

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銆€銆€閫欐檪(sh铆)m1-m2鈮坢1,m1+m2鈮坢1.鍓囨湁v1'=v1 v2'=2v1

銆€銆€鑻1<

銆€銆€閫欐檪(sh铆)m1-m2鈮�-m2, 2m1/(m1+m2)鈮�0.鍓囨湁v1'=-v1 v2'=0

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銆€銆€m1v1+m2v2=(m1+m2)v

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