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Question

The physical quantity which is conserved for all types of collisions when no external force is acting on the system is:
  1. Mass
  2. Momentum
  3. Kinetic energy
  4. Length

A
Kinetic energy
B
Momentum
C
Mass
D
Length
Solution
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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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