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A moving ball of mass m undergoes a head...

A moving ball of mass m undergoes a head - on elastic collision with another ball of mass 2 m at rest .Show that the colliding ball loses `8/9 th` of its K.E. energy after collision.

A

`1//9` of its initial kinetic energy

B

`1//4` of its initial knetic energy

C

`1//2` of its initial kinetic energy

D

`8//9` of its initial kinetic energy.

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