ÌâÄ¿ÄÚÈÝ
¾ßÓÐÎÒ¹ú×ÔÖ÷֪ʶ²úȨµÄ¡°¼ß£10¡±·É»úµÄºá¿Õ³öÊÀ£¬Ö¤ÊµÁËÎÒ¹úº½¿ÕÊÂÒµÔÚ·ÉËÙ·¢Õ¹£®¶øº½¿ÕÊÂÒµµÄ·¢Õ¹ÓÖÀë²»¿ª·ç¶´ÊÔÑ飬¼ò»¯Ä£ÐÍÈçͼaËùʾ£¬Ôڹ⻬µÄˮƽ¹ìµÀÉÏÍ£·ÅÏà¾às0£½10 mµÄ¼×¡¢ÒÒÁ½³µ£¬ÆäÖÐÒÒ³µÊÇ·çÁ¦Çý¶¯³µ£®ÔÚµ¯Éä×°ÖÃʹ¼×³µ»ñµÃv0£½40 m/sµÄ˲ʱËÙ¶ÈÏòÒÒ³µÔ˶¯µÄͬʱ£¬ÒÒ³µµÄ·ç¶´¿ªÊ¼¹¤×÷£¬½«·ç´µÏò¹Ì¶¨Ôڼ׳µÉϵĵ²·ç°å£¬´Ó¶øʹÒÒ³µ»ñµÃÁËËٶȣ¬²â»æ×°Öõõ½Á˼ס¢ÒÒÁ½³µµÄv£tͼÏóÈçͼbËùʾ£¬ÉèÁ½³µÊ¼ÖÕδÏàײ£®
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026238226549.jpg)
(1)Èô·ç¶Ô¼×¡¢ÒÒµÄ×÷ÓÃÁ¦ÏàµÈ£¬Çó¼×¡¢ÒÒÁ½³µµÄÖÊÁ¿±È£»
(2)ÇóÁ½³µÏà¾à×î½üʱµÄ¾àÀ룮
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026238226549.jpg)
(1)Èô·ç¶Ô¼×¡¢ÒÒµÄ×÷ÓÃÁ¦ÏàµÈ£¬Çó¼×¡¢ÒÒÁ½³µµÄÖÊÁ¿±È£»
(2)ÇóÁ½³µÏà¾à×î½üʱµÄ¾àÀ룮
£¨1£©
£¨2£©4.0m
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623837327.png)
ÊÔÌâ·ÖÎö£º (1)ÓÉÌâͼb¿ÉÖª£º¼×³µµÄ¼ÓËٶȴóСa¼×£½
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623853490.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623853490.png)
ÒÒ³µµÄ¼ÓËٶȴóСaÒÒ£½
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623853490.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623853490.png)
ÒòΪm¼×a¼×£½mÒÒaÒÒ ½âµÃ
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623853490.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623837327.png)
(2)ÔÚt1ʱ¿Ì£¬¼×¡¢ÒÒÁ½³µµÄËÙ¶ÈÏàµÈ£¬¾ùΪv£½10 m/s£¬´ËʱÁ½³µÏà¾à×î½ü£¬
¶ÔÒÒ³µÓУºv£½aÒÒt1
¶Ô¼×³µÓУºv£½a¼×(0.4£t1)
¿É½âµÃt1£½0.3s
µ½ËÙ¶ÈÏàµÈʱ¼×³µµÄλÒÆ
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623978934.png)
ÒÒ³µµÄλÒÆ
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002623993820.png)
Á½³µÏà¾à×î½üµÄ¾àÀëΪsmin£½s0£«sÒÒ£s¼×£½4.0 m.
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿