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A stone of mass \( m_{1} \) moving with a uniform speed \( v \) suddenly explodes on its own into two
\( \mathrm{P} \) fragments. If the fragment of mass \( m_{2} \) is at rest, the speed of the other fragment is-
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(1) \( \frac{m_{1} v}{\left(m_{1}-m_{2}\right)} \)
(2) \( \frac{m_{2} v}{\left(m_{1}-m_{2}\right)} \)
(3) \( \frac{m_{1} v}{\left(m_{1}+m_{2}\right)} \)
(4) \( \frac{m_{1} v}{m_{2}} \)
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