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An artillery piece of mass M 1 fires a shell of mass M 2 horizontally. Instantaneously after the firing, the ratio of kinetic energy of the artillery and that of the shell is:

1. 1 2 M M
2. ( ) 2 1 2 M M M +
3. 2 1 M M
4. ( ) 2 1 1 M M M +

Correct answer: 1 2 M M

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