A ball of mass \( m \) moving with speed \( u \) undergoes a head-on elastic collision with a ba...

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A ball of mass \( m \) moving with speed \( u \) undergoes a head-on elastic collision with a ball of mass \( \mathrm{nm} \) initially at rest. The fraction of the incident energy transferred to the second ball is
(1) \( \frac{n}{1+n} \)
(2) \( \frac{n}{(1+n)^{2}} \)
(3) \( \frac{2 n}{(1+n)^{2}} \)
(4) \( \frac{4 n}{(1+n)^{2}} \)
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