ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÎªÒ»Áмòгºá²¨ÔÚt=0 ʱµÄ²¨ÐÎͼ£¬P ÊÇƽºâλÖÃÔÚx=0.5m ´¦µÄÖʵ㣬Q ÊÇƽºâλÖÃÔÚx=2.0m ´¦µÄÖʵ㣻ͼ£¨b£©ÎªÖʵãQ µÄÕñ¶¯Í¼Ïó£®ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨____£©
A£®ÕâÁмòг²¨ÑØx ÖáÕý·½Ïò´«²¥
B£®ÕâÁмòг²¨ÑØx ÖḺ·½Ïò´«²¥
C£®²¨µÄ´«²¥ËÙ¶ÈΪ20m/s
D£®´Ót=0 µ½t=0.25s£¬²¨´«²¥µÄ¾àÀëΪ 50cm
E£®ÔÚt=0.10s ʱ£¬ÖʵãQµÄ¼ÓËٶȷ½ÏòÓëy ÖáÕý·½ÏòÏàͬ
¡¾´ð°¸¡¿ACE;
¡¾½âÎö¡¿
ÓÉbͼ֪£¬ÔÚʱ¿ÌQÖʵãÏòÉÏÕñ¶¯£¬¸ù¾Ý¡°ÉÏÏÂÆ·¨¡±£¬Öª²¨ÑØxÖáÕý·½Ïò´«²¥£¬¹ÊAÕýÈ·£¬B´íÎó£»Óɲ¨¶¯Í¼ÏóÖª£¬²¨³¤Îª£¬ÓÉÕñ¶¯Í¼ÏóÖª£¬Õñ¶¯µÄÖÜÆÚΪ£¬²¨´«²¥µÄÖÜÆÚÓëÖʵãµÄÕñ¶¯ÖÜÆÚÏàµÈ£¬Ôò²¨ËÙΪ£¬¹ÊCÕýÈ·£»´Óµ½£¬²¨´«²¥µÄ¾àÀëΪ£¬¹ÊD´íÎó£»ÔÚʱ£¬¼´¾¹ý°ë¸öÖÜÆÚ£¬ÖʵãPÔÚƽºâλÖÃÏ·½£¬¼ÓËٶȵķ½ÏòÑØyÖáÕý·½Ïò£¬¹ÊEÕýÈ·¡£
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿