Question

£¨08ÄêÀ¼ÖÝÒ»ÖÐÔ¿¼£©£¨14·Ö£©Èçͼ14Ëùʾ£¬ÓÐÒ»¸öÊúÖ±¹Ì¶¨ÔÚµØÃæµÄ͸ÆøԲͲ£¬Í²ÖÐÓÐÒ»Çᵯ»É£¬Æä϶˹̶¨£¬É϶ËÁ¬½ÓÒ»ÖÊÁ¿ÎªmµÄ±¡»¬¿é£¬µ±»¬¿éÔ˶¯Ê±£¬Ô²Í²ÄÚ±Ú¶Ô»¬¿éÓÐ×èÁ¦µÄ×÷Óã¬×èÁ¦µÄ´óСºãΪf=£¨gΪÖØÁ¦¼ÓËٶȣ©¡£ÔÚ³õʼλÖû¬¿é¾²Ö¹£¬Ô²Í²ÄÚ±Ú¶Ô»¬¿éµÄ×èÁ¦ÎªÁ㣬µ¯»ÉµÄ³¤¶ÈΪl¡£ÏÖÓÐÒ»ÖÊÁ¿Ò²ÎªmµÄÎïÌå´Ó¾àµØÃæ2l´¦×ÔÓÉÂäÏ£¬Ó뻬¿é·¢ÉúÅöײ£¬Åöײʱ¼ä¼«¶Ì¡£ÅöײºóÎïÌåÓ뻬¿éÕ³ÔÚÒ»ÆðÏòÏÂÔ˶¯£¬Ô˶¯µ½×îµÍµãºóÓÖ±»µ¯»ØÏòÉÏÔ˶¯£¬»¬¶¯µ½³õʼλÖÃʱËÙ¶ÈÇ¡ºÃΪÁ㣬²»¼Æ¿ÕÆø×èÁ¦¡£Çó£º

£¨1£©ÎïÌåÓ뻬¿éÅöײºó¹²Í¬Ô˶¯³õËٶȵĴóС£»

£¨2£©Åöײºó£¬ÔÚ»¬¿éÏòÏÂÔ˶¯µ½×îµÍµãµÄ¹ý³ÌÖе¯»Éµ¯ÐÔÊÆÄܵı仯Á¿¡£ 

Answer 1

½âÎö£º£º£¨1£©ÉèÅöײǰÎïÌåµÄËÙ¶ÈΪv₀£¬

 

ÓÐmgl=¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©

 

ÉèÅöײºó¹²Í¬ËÙ¶ÈΪv£¬ÓÐmv₀=2mv¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©

 

½âµÃv=¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©

 

£¨2£©ÉèÏ»¬µÄ×î´ó¾àÀëΪs£¬ÓÉÅöײ¹¸¿ªÊ¼µ¯»ØñÉʼλÖõĹý³ÌÖÐÓУº

 

¡­¡­¡­¡­¡­¡­¡­¡­4·Ö

 

ÓÉÅöײºó¿ªÊ¼Ô˶¯µ½×îµÍµãµÄ¹ý³ÌÖУ¬É赯ÐÔÊÆÄܵı仯Á¿ÎªÓУº

 

¡­¡­¡­¡­¡­¡­¡­¡­4·Ö

 

½âµÃ£º¡­¡­¡­¡­¡­¡­¡­¡­2·Ö