ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾΪһÁÐÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨ÔÚijʱ¿ÌµÄ²¨ÐÎͼ£¬x=1.0m´¦µÄMÖʵã´Ó¸Ãʱ¿Ì¿ªÊ¼¾0.6sµÚÒ»´Îµ½´ï²¨¹ÈλÖá£ÒÑÖªÖʵãPµÄƽºâλÖÃ×ø±êΪx=2.0m£¬ÖʵãQµÄƽºâλÖÃ×ø±êΪx=3.5m£¬Ôò
A. ¸Ã¼òг²¨µÄ²¨ËÙΪ5m/s
B. ͼʾʱ¿ÌÖʵãQÕýÔÚÑØyÖáÕý·½ÏòÔ˶¯
C. ´Óͼʾʱ¿Ì¿ªÊ¼£¬ÖʵãQ¾¹ý0.7sµÚÒ»´Îµ½´ï²¨·åλÖÃ
D. ÔÚijʱ¿Ì£¬ÖʵãPºÍQµÄËٶȡ¢¼ÓËٶȿÉÄܶ¼Ïàͬ
¡¾´ð°¸¡¿AC
¡¾½âÎö¡¿²¨ÑØxÖáÕý·½Ïò´«²¥£¬ÔòMµã´ËʱÏòÉÏÕñ¶¯£¬ MÖʵã´Ó¸Ãʱ¿Ì¿ªÊ¼¾0.6sµÚÒ»´Îµ½´ï²¨¹ÈλÖ㬿ÉÖªT=0.8s£»²¨ËÙ£¬Ñ¡ÏîAÕýÈ·£»Óɲ¨ÐÎͼ¿ÉÖª£¬Í¼Ê¾Ê±¿ÌÖʵãQÕýÔÚÑØyÖḺ·½ÏòÔ˶¯£¬Ñ¡ÏîB´íÎó£»²¨ÏòÇ°´«²¥3.5mʱQµÚÒ»´Îµ½´ï²¨·åλÖã¬Ðèʱ¼äΪ£¬Ñ¡ÏîCÕýÈ·£»ÖʵãPºÍQÖ®¼äµÄ¾àÀë²»ÊÇÕû²¨³¤£¬ÔòÔÚijʱ¿Ì£¬ÖʵãPºÍQµÄËٶȡ¢¼ÓËٶȲ»¿ÉÄܶ¼Ïàͬ£¬Ñ¡ÏîD´íÎó£»¹ÊÑ¡AC.
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿