题目内容

物体A的质量是B的2倍且静止,物体B以一定的动能E与A碰撞后粘在一块并以共同的速度运动, 碰撞后两物体的总动能为()

A. E
B. E/2
C. E/3
D. 2E/3

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物体A的质量是B的2倍且静止,物体B以一定的动能E与A碰撞后粘在一块并以共同的速度运动, 碰撞后两物体的总动能为()

A. E B. E/2 C. E/3 D. 2E/3

Your pen writes___. Where did you buy it?

He has lived and worked in China___1996.

You will be able to get good marks ____

—This dress is in last year’s style. —I think it still looks perfect ____ it has gone out this year.

A. E
B. E/2
C. E/3
D. 2E/3