Question

1£®Ä³Í¬Ñ§ÂòÁËÒ»ÕÅÁгµÊ±¿Ì±í£®Ëû×¢Òâµ½ÔÚ±±¾©ºÍÉϺ£¼äÍù·µµÄD31ºÍD32´Î¶¯³µµÄÔËÐÐʱ¿Ì±íÈçÏ£º

³µ´Î	µ½Õ¾¡¢·¢³µ	±±¾©ÄÏ	̩ɽ	ÄϾ©	ÉϺ£
D31	µ½Õ¾Ê±¼ä	--	16£º33	19£º12	21£º05
	·¢³µÊ±¼ä	11£º05	16£º34	19£º14	--
D32	µ½Õ¾Ê±¼ä	20£º38	17£º12	12£º40	--
	·¢³µÊ±¼ä	--	17£º14	12£º42	10£º31

ËûÁ˽⵽D31´ÎÁгµÓɱ±¾©¿ªÍùÉϺ££¬D32´ÎÁгµÓÉÉϺ£¿ªÍù±±¾©£®ÕâÁ½´ÎÁгµÃ¿Ìì¸÷·¢Ò»ÌË£®×Ô±±¾©µ½ÉϺ£Ìú·³¤1460km£®¸ù¾ÝÁгµÊ±¿Ì±í»Ø´ðÏÂÁÐÎÊÌ⣺
£¨1£©Äã´ÓÁгµÊ±¿Ì±í¿É»ñµÃÄÄЩÐÅÏ¢£¨Ð´³öÁ½Ìõ£©
£¨2£©¼ÆËã˵Ã÷D31¡¢D32´ÎÁгµÔËÐÐʱ¼ä²îΪ¶àÉÙ£¿
£¨3£©¼ÆËãD31´ÎÁгµÓɱ±¾©¿ªÍùÉϺ£µÄƽ¾ùËÙ¶ÈÊǶàÉÙkm/h£¿

Answer 1

·ÖÎö £¨1£©ÁгµÊ±¿Ì±íËù°üº¬µÄÄÚÈÝÓУºÁгµÔÚ³µÕ¾µÄ³ö·¢¡¢µ½´ï¡¢Í£¿¿Ê±¼ä£¬ÁгµµÄÐͺš¢Ê¼·¢Õ¾¡¢ÖÕµãÕ¾µÈÄÚÈÝ£®
£¨2£©¡°D31´ÎÁгµÓɱ±¾©¿ªÍùÉϺ££¬D32´ÎÓÉÉϺ£¿ªÍù±±¾©¡±£¬Çó³öÕâÁ½ÁгµµÄÔËÐÐʱ¼ä£¬ÔÙ¼ÆËãÔËÐÐʱ¼ä²î£®
¢Ú¼ÆËã³ö¡°31´ÎÁгµÓɱ±¾©Ê»ÍùÉϺ£µÄÔËÐÐʱ¼ä£¬ÖªµÀÀï³ÌÊý£¬ÀûÓÃËٶȹ«Ê½Çó½â£®

½â´ð ½â£º£¨1£©ÓÉÁгµÊ±¿Ì±í¿ÉÖª£ºD31´ÎÁгµ´Ó±±¾©ÄÏ·¢³µ£¬·¢³µÊ±¼äÊÇ11h05min£»µ½´ïÉϺ£Ê±¼äÊÇ21h05min£»
£¨2£©D31´ÎÁгµ´Ó±±¾©µ½ÉϺ£µÄÔËÐÐʱ¼ä£ºt₁=21£º05-11£º05=10h£¬
D32´ÎÁгµ´ÓÉϺ£µ½±±¾©µÄÔËÐÐʱ¼ä£ºt₂=20£º38-10£º31=10h07min£¬
D31¡¢D32´ÎÁгµÔËÐÐʱ¼ä²î£ºt₁-t₂=10h07min-10h=7min£»
£¨3£©s₁=1463km£¬t₁=10h£¬
v₁=$\frac{{s}_{1}}{{t}_{1}}$=$\frac{1460km}{10h}$=146km/h£®
´ð£º£¨1£©ÓÉÉϱí¿ÉÒÔ¿´³ö£ºD31´ÎÁгµ´Ó±±¾©ÄÏ·¢³µ£¬·¢³µÊ±¼äÊÇ11h05min£»µ½´ïÉϺ£Ê±¼äÊÇ21h05min£»
£¨2£©D31´Î±ÈD32´ÎÔËÐÐʱ¼ä¶à7min£»
£¨3£©D31´ÎÁгµÓɱ±¾©¿ªÍùÉϺ£µÄƽ¾ùËÙ¶ÈÊÇ146km/h£®

µãÆÀ ÇóÁгµ´Ó±±¾©µ½ÉϺ£µÄƽ¾ùËٶȣ¬Â·³ÌÒ»¶¨£¨1460km£©£¬Ê±¼äÓ¦°üÀ¨ÖмäÔÚ̩ɽ¡¢ÄϾ©Í£ÁôµÄʱ¼ä£¬ÓÃ×Ü·³Ì³ýÒÔ×Üʱ¼ä£®