If a shell fired from a cannon explodes in mid air, its total?
A
Momentum increases
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B
Momentum decreases
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C
Kinetic energy increases
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D
Kinetic energy remains unchanged
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Solution
The correct option is C Kinetic energy increases The chemical energy of the shell is converted to mechanical energy. The external potential energy gets converted to its kinetic energy due to explosion. So kinetic energy increases. But the total momentum remains constant.