A shell at rest on a smooth horizontal surface explodes into two fragments of masses $m_1$ and $m_2$. If just after explosion $m_1$ move with speed $u$, then work done by internal forces during explosion is
A shell at rest on a smooth horizontal surface explodes into two fragments of masses $m_1$ and $m_2$. If just after explosion $m_1$ move with speed $u$, then work done by internal forces during explosion is
- A
$\frac{1}{2}\left(m_1+m_2\right) \frac{m_2}{m_1} u^2$
- B
$\frac{1}{2}\left(m_1+m_2\right) u^2$
- C
$\frac{1}{2} m_1 u^2\left(1+\frac{m_1}{m_2}\right)$
- D
$\frac{1}{2}\left(m_2-m_1\right) u^2$
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