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A shell is fired from a cannon, it explodes in mid air, its total

1. momentum increases
2. momentum decreases
3. K.E. increases
4. K.E. decreases

Correct answer: K.E. increases

Solution

When the shell explodes, its kinetic energy increases due to the release of internal energy stored in the shell. However, the total momentum of the system remains conserved as no external force acts on it.

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