ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬Ì×ÔÚÊúֱϸ¸ËÉϵĻ·AÓÉ¿ç¹ý¶¨»¬ÂÖÇÒ²»¿ÉÉ쳤µÄÇáÉþÓëBÏàÁ¬£¬ÔÚÍâÁ¦×÷ÓÃÏÂAÑظËÒÔËÙ¶ÈvAÔÈËÙÉÏÉý¾¹ýP¡¢Q£¬¾¹ýPµãʱÉþÓëÊúÖ±¸Ë¼äµÄ½Ç¶ÈΪ¦Á£¬¾¹ýQµãʱAÓ붨»¬ÂÖµÄÁ¬Ïß´¦ÓÚˮƽ·½Ïò£¬Ôò¡¡¡¡
A. ¾¹ýQµãʱ£¬BµÄËٶȷ½ÏòÏòÏÂ
B. ¾¹ýPµãʱ£¬BµÄËٶȵÈÓÚ
C. µ±A´ÓPÖÁQµÄ¹ý³ÌÖУ¬B´¦ÓÚʧÖØ״̬
D. µ±A´ÓPÖÁQµÄ¹ý³ÌÖУ¬BÊܵ½µÄÀÁ¦´óÓÚÖØÁ¦
¡¾´ð°¸¡¿D
¡¾½âÎö¡¿
¶ÔÓÚA£¬ËüµÄËÙ¶ÈÈçͼÖбê³öµÄvA£¬Õâ¸öËٶȿ´³ÉÊÇAµÄºÏËٶȣ¬Æä·ÖËٶȷֱðÊÇva£¬vb£¬
ÆäÖÐva¾ÍÊÇBµÄËÙ¶ÈvB£¨Í¬Ò»¸ùÉþ×Ó£¬´óСÏàͬ£©£¬¸Õ¿ªÊ¼Ê±BµÄËÙ¶ÈΪvB=vAcos¦Á£»µ±A»·ÉÏÉýÖÁÓ붨»¬ÂÖµÄÁ¬Ïß´¦ÓÚˮƽλÖÃʱ£¬va=0£¬ËùÒÔBµÄËÙ¶ÈvB=0£¬¹ÊAB´íÎó£»ÒòAÔÈËÙÉÏÉýʱ£¬Óɹ«Ê½vB=vAcos¦Á£¬µ±AÉÏÉýʱ£¬¼Ð½Ç¦ÁÔö´ó£¬Òò´ËB×öÏòϼõËÙÔ˶¯£¬Ôò´¦ÓÚ³¬ÖØ״̬£¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬¿ÉÖªÉþ¶ÔBµÄÀÁ¦´óÓÚBµÄÖØÁ¦£¬¹ÊC´íÎó¡¢DÕýÈ·£»
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿