In law of conservation of momentum the object experiences no external force then how it move?

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Solution

One of the most powerful laws in physics is the law of momentum conservation. The law of momentum conservation can be stated as follows.
For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. That is, the momentum lost by object 1 is equal to the momentum gained by object 2.

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

Statement

1

:- The total momentum of the two parts must be equal to the momentum of the block before explosion.

Statement

2

:- If no external force acts on a system, then the linear momentum of the system will be conserved.

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