In an elastic collision between two particles

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the total kinetic energy of the system is always conserved.

the kinetic energy of the system before collision is equal to the kinetic energy of the system after collision.

the linear momentum of the system is conserved.

the mechanical energy of the system before collision is equal to the mechanical energy of the system after collision.

answer is B.

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Detailed Solution

In an elastic collision, linear momentum of the system is always conserved i.e., in all the three stages of collision. But the kinetic energy of the system is not always conserved. It is conserved only before and after the collision. During collision it gets converted into elastic potential energy.

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