ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Ä³½éÖÊÖÐÐγÉÒ»Áмòг²¨£¬t=0ʱ¿ÌµÄ²¨ÐÎÈçͼÖÐʵÏßËùʾ¡£
£¨1£©Èô²¨ÏòÓÒ´«²¥¡£Áãʱ¿Ì¸ÕºÃ´«µ½Bµã£¬ÇÒÔÙ¾¹ý0.6s£¬PµãÒ²¿ªÊ¼ÆðÕñ¡£
Ç󣺸ÃÁв¨µÄÖÜÆÚT£»´Ót=0ʱ¿ÌÆðµ½PµãµÚÒ»´Î´ïµ½²¨¹ÈµÄ¹ý³ÌÖУ¬Oµã¶ÔƽºâλÖõÄλÒÆy0¼°ÆäËù¾¹ýµÄ·³Ìs0¸÷Ϊ¶àÉÙ£¿
£¨2£©Èô´ËÁв¨µÄ´«²¥ËٶȴóСΪ20m/s£¬ÇÒ²¨ÐÎÓÉʵÏß±äΪÐéÏßÐèÒª¾Àú0.575sʱ¼ä£¬Ôò¸ÃÁв¨µÄ´«²¥·½ÏòÈçºÎ£¿
¡¾´ð°¸¡¿(1) 0.2s£»Î»ÒÆΪ10cm£¬Â·³Ì130cm (2) ¸Ã²¨ÏòÓÒ´«²¥
¡¾½âÎö¡¿£¨1£©ÓÉÌâÒâÖª£¬Õñ¶¯ÐÎʽ´ÓBÔÈËÙ´«²¥µ½PµãÓÃ0.6s£¬ËùÒÔ´«²¥Ëٶȣº £¬ÓÉͼ֪²¨³¤Îª2m£¬ËùÒÔÖÜÆÚT=¦Ë/v=0.2s£»ÓÉͼ֪Bµã¿ªÊ¼ÏòÏÂÕñ¶¯£¬¹ÊPµãÒ²ÊÇ¿ªÊ¼ÏòÏÂÕñ¶¯£¬ËùÒÔÓÃʱ3T+T/4 £¬ÔÚt=0ʱ¿ÌOµãÏòÉÏÕñ¶¯£¬¾¹ýT/4µ½´ï²¨·å£¬Î»ÒÆΪ10cm£¬Â·³Ì130cm£»
£¨2£©²¨´«²¥µÄ¾àÀ룺x=vt=11.5m=5¦Ë++3¦Ë/4£¬½áºÏͼÐοÉÅжϸò¨ÏòÓÒ´«²¥¡£
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿