The physical quantity which is conserved for all types of collisions when no external force is acting on the system is:

Kinetic energy

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Mass

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Momentum

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Length

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Solution

The correct option is B Momentum
Momentum is conserved in all types of collision whether it is elastic or inelastic where as kinetic energy is lost in sound energy in the absence of external force in inelastic collision.

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If no external forces acts on a system of particles then the momentum of the system remains conserved.

For system on which no net external force acts, momentum is:

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