Question

ÈçͼËùʾ£¬Ôڹ⻬ˮƽÃæÉÏÓÐÁ½¸ö¿ÉÊÓΪÖʵãµÄ»¬¿éAºÍB£¬ËüÃǵÄÖÊÁ¿m_A=3kg£¬m_B=6kg£¬ËüÃÇÖ®¼äÓÃÒ»¸ù²»¿ÉÉ쳤µÄÇáÉþÁ¬½Ó£¬¿ªÊ¼Ê±¶¼´¦ÓÚ¾²Ö¹£¬ÉþËɳڣ¬A¡¢B½ô¿¿ÔÚÒ»Æð.ÏÖ¶ÔBÊ©¼ÓÒ»¸öˮƽÏòÓҵĺãÁ¦F=3N£¬B¿ªÊ¼Ô˶¯.ÖÁÉþ±Á½ôʱ£¬Á½»¬¿éͨ¹ýÇáÉþÏ໥×÷Óã¬Ï໥×÷ÓÃʱ¼ä¼«¶Ì£¬×÷ÓúóÁ½»¬¿éËÙ¶ÈÏàͬ£¬´ËºóÁ½»¬¿é¹²Í¬ÔÚºãÁ¦F×÷ÓÃϼÌÐøÔ˶¯£¬µ±Á½»¬¿éµÄËٶȴﵽʱ£¬B»¬¿é·¢ÉúµÄ×ÜλÒÆΪs=0.75m£¬ÇóÁ¬½ÓA¡¢BµÄÇáÉþµÄ³¤¶È£®

Answer 1

£¨16·Ö£©½âÎö£ºÉèÉþ³¤ÎªL£¬BÔ˶¯Î»ÒÆLµÄ¹ý³ÌÖУ¬Óɶ¯Äܶ¨ÀíµÃ

¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¢Ù3·Ö

½âµÃ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¢Ú2·Ö

ÉèA¡¢B˲¼äÏ໥×÷ÓýáÊøʱµÄ¹²Í¬ËÙ¶ÈΪv₂£¬Óɶ¯Á¿Êغ㣬ÓÐ

¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¢Û3·Ö

Ôò¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¢Ü2·Ö

Éþ±ÁÖ±ÒÔºó£¬ÉèB×ÜλÒÆΪsʱµÄ¹²Í¬ËÙ¶ÈΪv₃£¬¶ÔA¡¢BÕûÌ壬Óɶ¯Äܶ¨ÀíµÃ

¡­¡­¡­¡­¢Ý 4·Ö

ÓÉÒÔÉϸ÷ʽ´úÈëÊý¾Ý½âµÃL=0.25m¡­¡­¡­¡­¡­¡­¡­¡­2·Ö