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A ball of mass '2m' moving with velocity...

A ball of mass '2m' moving with velocity `u hat(i)` collides with another ball of mass 'm' moving with velocity `- 2 u hat(i)`. After the collision, mass 2m moves with velocity `(u)/(2) ( hat(i) - hat(j))`. Then the change in kinetic energy of the system ( both balls ) is

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