求详细的阶梯过程,谢谢~
å设河宽为L,æ°´é为v0,è¹é为v
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2ãåé度^2==è¹é^2+æ°´é^2
3ã以æçä½ç§»è¿æ²³çæçæ¶é´
å½vï¼v0æ¶,åt==L/(v^2-v0^2)^(1/2) (å³åç´æ²³å²¸è¿)
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1ãè¿æ²³æçæ¶é´==L/v (è¿æ²³æ¶é´ä¸åç´äºæ²³å²¸çé度大å°æå ³,å³è¦ä½¿åç´äºæ²³å²¸çé度æ大)
2ãåé度^2==è¹é^2+æ°´é^2
3ã以æçä½ç§»è¿æ²³çæçæ¶é´
å½vï¼v0æ¶,åt==L/(v^2-v0^2)^(1/2) (å³åç´æ²³å²¸è¿)
å½vâ¤v0æ¶,è¹æ æ³åç´äºæ²³å²¸è¿æ²³,æ¤æ¶åºä½¿è¹éåç´äºåé度,é£ä¹åç´äºæ²³å²¸çé度v2==(v/v0)(v0^2-v^2)^(1/2) â´t==L/v2==(v0/v)L/(v0^2-v^2)^(1/2)
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