When a cannon shell explodes in mid-air :

the momentum of the system is conserved in all cases

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the momentum of the system is conserved only if the shell was moving horizontally

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the kinetic energy of the system either remains constant or decreases

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the kinetic energy of the system always increases

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Solution

The correct options are
A the momentum of the system is conserved in all cases
D the kinetic energy of the system always increases
When a cannon shell explodes in mid-air, some energy is produced in the explosion hence, the kinetic energy of the system always increases.But the momentum of the system is conserved.

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Similar questions

(b) Total energy of a system is always conserved, no matter what internal and external forces on the body are present.

(d) In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

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