ÌâÄ¿ÄÚÈÝ
ÔÚãë´¨µØÕð·¢ÉúºóµÄ¼¸Ì죬ͨÏòãë´¨µÄ¹«Â·»¹ÕæÊÇÄÑ×ߣ¬Õâ²»£¬Ò»Á¾¾ÈÔÖÆû³µÓɾ²Ö¹¿ªÊ¼×öÔȱäËÙÖ±ÏßÔ˶¯£¬¸ÕÔ˶¯ÁË8s£¬ÓÉÓÚÇ°·½Í»È»ÓоÞʯ¹öÔÚ·ÖÐÑ룬ËùÒÔÓÖ½ô¼±É²³µ£¬¾4sÍ£ÔÚ¾Þʯǰ£®Ôò¹ØÓÚÆû³µµÄÔ˶¯Çé¿ö£¬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
·ÖÎö£ºÆû³µÏÈÓɾ²Ö¹¿ªÊ¼×öÔȼÓËÙÖ±ÏßÔ˶¯£¬É²³µºó×öÔȼõËÙÖ±ÏßÔ˶¯£¬¸ù¾Ý¼ÓËٶȵĶ¨Ò幫ʽÇó½â¼ÓËÙ¶ÈÖ®±È£»Óɹ«Ê½
=
Çó½âƽ¾ùËÙ¶ÈÖ®±È£»ÓÉx=
tÇó½âλÒÆÖ®±È£®
. |
v |
v0+v |
2 |
. |
v |
½â´ð£º½â£ºA¡¢BÉèÆû³µµÄ×î´óËÙ¶ÈΪv£¬Ôò¼ÓËÙÔ˶¯µÄ¼ÓËٶȴóСΪa1=
=
£¬¼õËÙÔ˶¯µÄ¼ÓËٶȴóСΪa2=|
|=
£¬Ôòa1£ºa2=t2£ºt1=4£º8=1£º2£®¹ÊAÕýÈ·£¬B´íÎó£®
C¡¢¼ÓËÙÔ˶¯µÄƽ¾ùËٶȴóСv1=
=
£¬¼õËÙÔ˶¯µÄƽ¾ùËٶȴóСv2=
=
£¬Ôòƽ¾ùËÙ¶ÈÖ®±Èv1£ºv2=1£º1£®¹ÊC´íÎó£®
D¡¢¼ÓËÙ¡¢¼õËÙÖеÄλÒÆÖ®±Ès1£ºs2=v1t1£ºv2t2=2£º1£®¹ÊD´íÎó£®
¹ÊÑ¡A
v-0 |
t1 |
v |
t1 |
0-v |
t2 |
v |
t2 |
C¡¢¼ÓËÙÔ˶¯µÄƽ¾ùËٶȴóСv1=
0+v |
2 |
v |
2 |
v+0 |
2 |
v |
2 |
D¡¢¼ÓËÙ¡¢¼õËÙÖеÄλÒÆÖ®±Ès1£ºs2=v1t1£ºv2t2=2£º1£®¹ÊD´íÎó£®
¹ÊÑ¡A
µãÆÀ£º±¾Ìâ¹Ø¼üÒªÕÆÎÕÔȱäËÙÖ±ÏßÔ˶¯µÄ¼ÓËٶȹ«Ê½¡¢Æ½¾ùËٶȺÍλÒƹ«Ê½£¬½áºÏÁ½¸öÔ˶¯µÄ¹Øϵ£¬½øÐÐÇó½â£®ÔËÓÃËÙ¶È--ʱ¼äͼÏó»á¸ü¼òµ¥£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿