Question

£¨2012Õã½­ÖصãÖÐѧЭ×÷Ìå¸ß¿¼·ÂÕæ²âÊÔ£©ÈçͼËùʾ£¬Ò»ÖÊÁ¿Îªm£½1 kgµÄСÎï¿éÇáÇá·ÅÔÚˮƽÔÈËÙÔ˶¯µÄ´«ËÍ´øÉϵÄAµã£¬Ëæ´«ËÍ´øÔ˶¯µ½Bµã£¬Ð¡Îï¿é´ÓCµãÑØÔ²»¡ÇÐÏß½øÈëÊúÖ±¹â»¬µÄ°ëÔ²¹ìµÀÇ¡ÄÜ×öÔ²ÖÜÔ˶¯£®ÒÑÖªÔ²»¡°ë¾¶R£½0.9m£¬¹ìµÀ×îµÍµãΪD£¬Dµã¾àˮƽÃæµÄ¸ß¶Èh£½0.8m£®Ð¡Îï¿éÀ뿪DµãºóÇ¡ºÃ´¹Ö±Åö»÷·ÅÔÚˮƽÃæÉÏEµãµÄ¹Ì¶¨Çãбµ²°å£®ÒÑÖªÎï¿éÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊý£½0.3£¬´«ËÍ´øÒÔ5 m/sºã¶¨ËÙÂÊ˳ʱÕëת¶¯£¨gÈ¡10 m/s²£©£¬ÊÔÇó£º

£¨1£©´«ËÍ´øABÁ½¶ËµÄ¾àÀ룻

£¨2£©Ð¡Îï¿é¾­¹ýDµãʱ¶Ô¹ìµÀµÄѹÁ¦µÄ´óС£»

£¨3£©Çãбµ²°åÓëˮƽÃæ¼äµÄ¼Ð½ÇµÄÕýÇÐÖµ£®

¡¢¡¢

Answer 1

¡¾½âÎö¡¿±¾ÌâÖ÷Òª¿¼²ìÅ£¶Ù¶¨ÂÉ¡¢ÎïÌå×÷Ô²ÖÜÔ˶¯µÄÁÙ½çµã¡¢

¶¯Äܶ¨Àí¼°Æ½Å×Ô˶¯µÈ֪ʶµã¡£Êô¼òµ¥ÌâÐÍ¡£

£¨1£©¶ÔСÎï¿é£¬ÔÚCµãÇ¡ÄÜ×öÔ²ÖÜÔ˶¯£¬ÓÉÅ£¶ÙµÚ¶þ¶¨Âɵãº

    £¬

    Ôò£®¡­¡­¡­¡­¡­¡­¡­¡­£¨2·Ö£©

ÓÉÓÚ£¬Ð¡Îï¿éÔÚ´«ËÍ´øÉÏÒ»Ö±¼ÓËÙ£¬ÔòÓÉAµ½BÓÐ

£¬¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨2·Ö£©

£¬

½«Ð¡Îï¿éÔÚEµãµÄËٶȽøÐзֽâµÃ£®¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨2·Ö£©

¡¾´ð°¸¡¿£¨1£©1.5m£»£¨6·Ö£©

£¨2£©£»£¨6·Ö£©

£¨3£©£®£¨4·Ö£©