Question

6£®Èçͼ£¬Îª²âÁ¿×öÔȼÓËÙÖ±ÏßÔ˶¯µÄÎï¿éµÄ¼ÓËٶȣ¬½«¿í¶ÈΪdµÄµ²¹âƬ¹Ì¶¨ÔÚÎïÌåÉÏ£¬²âµÃ¶þ¹âµçÃÅÖ®¼ä¾àÀëΪs£®
¢Ùµ±»¬¿éÔȼÓËÙÔ˶¯Ê±£¬²âµÃµ²¹âƬÏȺ󾭹ýÁ½¸ö¹âµçÃŵÄʱ¼äΪ¡÷t₁¡¢¡÷t₂£¬ÔòС³µµÄ¼ÓËÙ¶Èa=$\frac{{d}_{\;}^{2}}{2s}£¨\frac{1}{¡÷{t}_{2}^{2}}-\frac{1}{¡÷{t}_{1}^{2}}£©$
¢ÚΪ¼õСʵÑéÎó²î£¬¿É²ÉÈ¡µÄ·½·¨ÊÇ¡­BC
A£®Ôö´óÁ½µ²¹âƬ¿í¶Èd 
B£®Êʵ±¼õСÁ½µ²¹âƬ¿í¶Èd
C£®Ôö´óÁ½¹âµçÃÅÖ®¼äµÄ¾àÀës 
D£®¼õСÁ½¹âµçÃÅÖ®¼äµÄ¾àÀës£®

Answer 1

·ÖÎö £¨1£©¹âµçÃŲâÁ¿»¬¿é˲ʱËٶȵÄÔ­ÀíÊÇÕÚ¹âÌõͨ¹ý¹âµçÃŵÄËٶȿÉÒÔÓÃƽ¾ùËٶȴúÌ棬¼´v=$\frac{d}{t}$£¬Çó³öС³µ¾­¹ýÁ½¸ö¹âµçÃŵÄËٶȣ¬ÔÙ¸ù¾ÝÔ˶¯Ñ§¹«Ê½¼´¿ÉÇó³öÎïÌåµÄ¼ÓËÙ¶Èa£®
£¨2£©¸ù¾Ý¼«Ïޱƽü˼ÏëÓÃƽ¾ùËٶȴúÌæ˲ʱËٶȣ¬ÔòbҪС£»ÁíÍâA¡¢BµãÔ½Ô¶£¬Ïà¶ÔÎó²îԽС£®

½â´ð ½â£º£¨1£©µ²¹âƬͨ¹ý¹âµçÃŵÄƽ¾ùËٶȿÉÒÔÈÏΪÊÇС³µÔÚ´Ëʱ¿ÌµÄ˲ʱËٶȣ¬¹ÊС³µÁ½´Îͬ¹ý¹âµçÃŵÄËٶȷֱðΪ£º
Ôòµ²¹âƬµÚÒ»´Î¾­¹âµçÃÅʱµÄ˲ʱËÙ¶ÈΪ£ºv₁=$\frac{d}{¡÷{t}_{1}^{\;}}$
µ²¹âƬµÚ¶þ´Î¾­¹âµçÃÅʱµÄ˲ʱËÙ¶ÈΪ£ºv₂=$\frac{d}{¡÷{t}_{2}^{\;}}$
´Ë¶Îʱ¼äС³µµÄλÒÆΪd£¬ÓÉÔ˶¯Ñ§ËÙ¶ÈλÒƹØϵʽµÃ£º
${v}_{2}^{2}-{v}_{1}^{2}=2as$
´øÈëÊý¾ÝµÃ£ºa=$\frac{{d}_{\;}^{2}}{2s}£¨\frac{1}{¡÷{t}_{2}^{2}}-\frac{1}{¡÷{t}_{1}^{2}}£©$
£¨2£©dԽС£¬Ëù²âµÄƽ¾ùËÙ¶ÈÔ½½Ó½ü˲ʱËٶȣ¬sÔ½´ó³õËÙ¶ÈÓëÄ©ËٶȲî¾àÔ½´ó£¬ËÙ¶Èƽ·½²îÔ½´ó£¬Ïà¶ÔÎó²îԽС£®¹ÊΪ¼õСʵÑéÎó²î£¬¿É²ÉÈ¡µÄ·½·¨ÊǼõСÁ½µ²¹âƬ¿í¶Èd»òÔö´óÁ½µ²¹âƬ¼ä¾às£¬¹ÊBCÕýÈ·£®
¹ÊÑ¡£ºBC£®
¹Ê´ð°¸Îª£º£¨1£©$\frac{{d}_{\;}^{2}}{2s}£¨\frac{1}{¡÷{t}_{2}^{2}}-\frac{1}{¡÷{t}_{1}^{2}}£©$£»£¨2£©BC

µãÆÀ ±¾ÌâÓ¦ÕÆÎÕ¹âµçÃŲâÁ¿»¬¿é˲ʱËٶȵÄÔ­Àí£¬ÕýÈ·½øÐÐÎó²î·ÖÎö£¬ÊÇ¿¼²éѧÉú×ÛºÏÄÜÁ¦µÄºÃÌ⣮