A ball of mass $'m'$ moving with a speed $'u'$ under goes a head-on elastic collision with a ball of mass $(nm)$ initially at rest. The fraction of the incident energy transferred to the heaveir ball is
A ball of mass $'m'$ moving with a speed $'u'$ under goes a head-on elastic collision with a ball of mass $(nm)$ initially at rest. The fraction of the incident energy transferred to the heaveir ball is
- A
$\frac {n}{1+n}$
- B
$\frac{n}{{{{(1 + n)}^2}}}$
- C
$\frac{2n}{{{{(1 + n)}^2}}}$
- D
$\frac{4n}{{{{(1 + n)}^2}}}$
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