The linear momentum of a system of particles is the sum of linear momenta of the individual particles . Can we state a principle of conservation of linear momentum as "linear momentum of a system remains constant if no external force acts on it"???

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Solution

Yes this is true. When a bomb explodes in mid air, assuming no air resistance, the vector sum of momentum of all particles is the same as the momentum of bomb before it explodes if no othe force acts on it.

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