ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬ÊµÏßÊÇÑØxÖá´«²¥µÄÒ»Áмòгºá²¨ÔÚt£½0ʱ¿ÌµÄ²¨ÐÎͼ£¬ÖʵãPÇ¡ÔÚƽºâλÖã¬ÐéÏßÊÇÕâÁв¨ÔÚt£½0.2 sʱ¿ÌµÄ²¨ÐÎͼ¡£ÒÑÖª¸Ã²¨µÄ²¨ËÙÊÇ0.8 m/s£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ
£¨A£©ÕâÁв¨¿ÉÄÜÊÇÑØxÖáÕý·½Ïò´«²¥µÄ
£¨B£©t£½0ʱ£¬x£½4 cm´¦ÖʵãPµÄËÙ¶ÈÑØyÖḺ·½Ïò
£¨C£©ÖʵãPÔÚ0.6sʱ¼äÄÚ¾¹ýµÄ·³ÌΪ0.32m
£¨D£©ÖʵãPÔÚ0.4sʱ¿ÌËٶȷ½ÏòÓë¼ÓËٶȷ½ÏòÏàͬ
BC
½âÎö:¸Ã²¨²¨³¤Îª12cm£¬²¨ËÙΪ0.8m/s£¬ÖÜÆÚΪ£¬0.2sΪ£¬ÓÉʵÏßµ½ÐéÏßÖ»ÄÜÊÇÏò×ó´«²¥£¬A´í£»
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿