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  4. A shell explodes and many pieces fly off in different directions. The following is conserved.

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Q. A shell explodes and many pieces fly off in different directions. The following is conserved.

JIPMERJIPMER 2014Work, Energy and Power

Solution:

Because during explosion of a shell, $F_{\text{ext}} = 0$
hence according to law of conservation of momentum $\vec{P}_{\text{system}}=$ constant