ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬¹â»¬Ë®Æ½ÃæMNÉÏ·ÅÁ½ÏàͬСÎï¿éA¡¢B£¬×ó¶Ëµ²°å´¦ÓÐÒ»µ¯Éä×°ÖÃP£¬ÓÒ¶ËN´¦Óëˮƽ´«ËÍ´øÀíÏëÁ¬½Ó£¬´«ËÍ´øˮƽ²¿·Ö³¤¶ÈL=8m£¬ÑØÄæʱÕë·½ÏòÒԺ㶨ËÙ¶Èv =2m/sÔÈËÙת¶¯¡£Îï¿éA¡¢B£¨´óС²»¼Æ£©Óë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊý
¡£Îï¿éA¡¢BÖÊÁ¿mA=mB=1kg¡£¿ªÊ¼Ê±A¡¢B¾²Ö¹£¬A¡¢B¼äѹËõÒ»ÇáÖʵ¯»É£¬ÖüÓе¯ÐÔÊÆÄÜEp=16J¡£ÏÖ½â³ýËø¶¨£¬µ¯¿ªA¡¢B£¬µ¯¿ªºóµ¯»ÉµôÂ䣬¶ÔA¡¢B´ËºóµÄÔ˶¯Ã»ÓÐÓ°Ïì¡£g=10m/s2¡£Çó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241548179902767.jpg)
£¨1£©Îï¿éBÑØ´«ËÍ´øÏòÓÒ»¬¶¯µÄ×îÔ¶¾àÀë¡£
£¨2£©Îï¿éB´Ó»¬ÉÏ´«ËÍ´øµ½»Øµ½Ë®Æ½ÃæËùÓõÄʱ¼ä¡£
£¨3£©ÈôÎïÌåB·µ»ØˮƽÃæMNºóÓë±»µ¯Éä×°ÖÃPµ¯»ØµÄAÔÚˮƽÃæÉÏ·¢Éúµ¯ÐÔÕýÅö£¬ÇÒA¡¢BÅöºó»¥»»Ëٶȣ¬Ôòµ¯Éä×°ÖÃPÖÁÉÙ¶ÔA×ö¶àÉÙ¹¦²ÅÄÜÈÃABÅöºóBÄÜ´ÓQ¶Ë»¬³ö¡£
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154817865478.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241548179902767.jpg)
£¨1£©Îï¿éBÑØ´«ËÍ´øÏòÓÒ»¬¶¯µÄ×îÔ¶¾àÀë¡£
£¨2£©Îï¿éB´Ó»¬ÉÏ´«ËÍ´øµ½»Øµ½Ë®Æ½ÃæËùÓõÄʱ¼ä¡£
£¨3£©ÈôÎïÌåB·µ»ØˮƽÃæMNºóÓë±»µ¯Éä×°ÖÃPµ¯»ØµÄAÔÚˮƽÃæÉÏ·¢Éúµ¯ÐÔÕýÅö£¬ÇÒA¡¢BÅöºó»¥»»Ëٶȣ¬Ôòµ¯Éä×°ÖÃPÖÁÉÙ¶ÔA×ö¶àÉÙ¹¦²ÅÄÜÈÃABÅöºóBÄÜ´ÓQ¶Ë»¬³ö¡£
£¨1£©
£¨2£©
£¨3£©8J
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154818318570.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154818505401.png)
ÊÔÌâ·ÖÎö£º£¨1£©½â³ýËø¶¨ºó»úеÄÜÊغ㡢¶¯Á¿Êغã
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154819098967.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154819160579.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154819269696.png)
Bľ¿éÏòÓÒ×÷¼õËÙÔ˶¯
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154819441594.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154819597777.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154819753637.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154818318570.png)
£¨2£©Bľ¿éÏòÓÒ×÷¼õËÙÔ˶¯µÄʱ¼ä
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154819925671.png)
Bľ¿éÏò×ó×÷¼ÓËÙÔ˶¯ËٶȵÈÓÚ´«ËÍ´øËÙ¶Èʱ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154820003827.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154820081620.png)
Bľ¿éÓë´«ËÍ´ø¹²ËÙÒ»ÆðÏò×óÔÈËÙÔ˶¯
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154820237829.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154820642713.png)
£¨3£©BÄÜ´ÓQ¶Ë»¬³öÒ»¶¨ÓÐ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154820736822.png)
AÓëBÖÊÁ¿ÏàµÈ£¬ÍêÈ«µ¯ÐÔÅöײºóËٶȻ¥»»£¬ÔòÅöºóA¡¢BµÄËÙ¶Èv¡äA=v¡äB¡Ý
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154821017618.png)
W£½
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154821141339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154821141339.png)
µãÆÀ£ºµ¯»Éµ¯¿ªµÄ¹ý³ÌÖУ¬ÏµÍ³»úеÄÜÊغ㣬½áºÏ¶¯Á¿Êغ㣬½âµÃAºÍBµÄËٶȣ¬B»¬ÉÏ´«ËÍ´ø×öÔȼõËÙÔ˶¯£¬µ±ËٶȼõΪ0ʱ£¬ÏòÓÒÔ˶¯µÄ¾àÀë×î´ó£¬Óɶ¯Äܶ¨Àí¼´¿ÉÇó½â£»£¨2£©Îï¿éBÏÈÏòÓÒ×öÔȼõËÙÔ˶¯£¬Ö±µ½ËٶȼõСΪ0£¬È»ºó·´·½Ïò×öÔȼÓËÙÔ˶¯£¬µ½Æ¤´ø×ó¶ËʱËٶȴóСÈÔΪvBÓɶ¯Á¿¶¨Àí½â³öÔ˶¯Ê±¼ä£¬·Ö±ðÇó³öBÏòÓÒÔȼõËÙÔ˶¯ÒòĦ²ÁÁ¦¶ø²úÉúµÄÈÈÄܺÍÏò×óÔȼÓËÙÔ˶¯ÒòĦ²ÁÁ¦¶ø²úÉúµÄÈÈÄÜ£¬½ø¶øÇó³ö×ÜÈÈÄÜ£®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿