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A particle of mass m moving with kinetic...

A particle of mass `m` moving with kinetic energy `K`, makes a head - on elastic collision with a stationary particle of mass `eta m`. The maximum potential energy stored in the system during the collision is

A

k/n

B

`((n-1)k)/n`

C

`((n+1)k)/n`

D

`(nk)/((n+1))`

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