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A smooth sphere of mass \( M \) moving with velocity \( u \) directly collides elastically with
P another sphere of mass \( m \) at rest. After collision

W their final velocities are \( V \) and \( v \) respectively. The value of \( v \) is
(1) \( \frac{2 \mathrm{uM}}{\mathrm{m}} \)
(2) \( \frac{2 u m}{M} \)
(3) \( \frac{2 \mathrm{u}}{1+\frac{m}{M}} \)
(4) \( \frac{2 \mathrm{u}}{1+\frac{M}{m}} \)
\( \theta \)
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