ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Èçͼ¼×Ëùʾ£¬ÖÊÁ¿Îª1kgµÄÎï¿éµþ·ÅÔÚľ°åÓҶˣ¬×ã¹»³¤µÄľ°å·ÅÔڹ⻬µÄˮƽµØÃæÉÏ£¬½ñÔÚľ°åÓÒ¶ËÊ©¼ÓˮƽÏòÓÒµÄÀÁ¦F£¬FµÄ´óС¿É±ä£¬·½Ïò²»±ä£¬Í¼ÒÒΪ0~2sÄÚľ°åµÄv-tͼÏó¡£ÒÑ֪ľ°åµÄÖÊÁ¿Îª3kg£¬ÖØÁ¦¼ÓËÙ¶Èg=10m/s2£¬Ä¾°åÓëÎï¿éÖ®¼äµÄ¶¯Ä¦²ÁÒòÊýΪ0.2£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ
A.0~1sÄÚÎï¿é×öÔȼÓËÙÔ˶¯µÄ¼ÓËٶȴóСΪ1m/s2
B.ÔÚµÚ1sÄÚ£¬ÀÁ¦FµÄ´óСΪ14N
C.ÔÚµÚ2sÄÚ£¬ÀÁ¦FµÄ´óСΪ4N
D.ÔÚµÚ2sÄ©£¬Îï¿éµÄËÙ¶ÈСÓÚľ°åµÄËÙ¶È
¡¾´ð°¸¡¿B
¡¾½âÎö¡¿
A£®ÓÉÌâ·ÖÎö¿ÉÖª£¬0~1sÄÚÎï¿é×öÔȼÓËÙÔ˶¯µÄ¼ÓËٶȴóСΪ
¹ÊA´íÎó£»
B£®ÓÉͼÏñ¿ÉÖª£¬ÔÚµÚ1sÄÚľ°åµÄ¼ÓËÙ¶ÈΪ
¶Ôľ°åÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÓÐ
½âµÃ
¹ÊBÕýÈ·£»
C£®ÔÚµÚ2sÄÚ£¬Ä¾°åÔÈËÙ£¬ÔòÓÐ
¹ÊC´íÎó£»
D£®Îï¿éµÄ¼ÓËÙ¶ÈΪ2m/s2£¬2sÄ©µÄËÙ¶ÈΪ
Óëľ°åËÙ¶ÈÏàµÈ£¬¹ÊD´íÎó¡£
¹ÊÑ¡B¡£
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿