具体是：
问题描述：
具体是：
A space vehicle made up of two parts is travelling at 230 m/s
the mass of partA is 450kg,the mass of partB is 1200 kg.
an explosion causes the 450 kg part to separate and travel with a final velocity of 280 m/s
What was the magnitude of the impulse on the 1200kg part during the seperation?
答
the magnitude of the impulse of the sapcce vehicle before explosion （爆炸前宇宙飞船的动量）：(450+1200)*230= 379 500 Nmthe magnitude of the impulse of A after explosion（爆炸后A的动量）：450*280=126 ...