A ball of mass in moving with speed u un...

A ball of mass in moving with speed `u` undergoes a head-on elastic collision with a ball of mass `nm` initially at rest. The fraction of the incident energy transferred to the second ball is

`n/(1+n)`

`n/(1+n)^2`

`(2n)/(1+n)^2`

`(4n)/(1+n)^2`

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