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A block moving in air explodes into two parts then just after explosion (neglect change in momentum due to gravity)

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The total kinetic energy of two parts must be same to the momentum of the block before explosion.

The total momentum of two parts must be same to the momentum of the block before explosion.

The total momentum must change.

The total kinetic energy must be constant.

answer is A.

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Detailed Solution

As there is no external force velocity of centre of mass remain same.

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