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A shell of mass 200 gm is ejected from a gun of mass 4 kg by an explosion that generates 1.05kJ of energy . The initial velocity of the shell is :

$\begin {array} {1 1} (1)\;120\: ms^{-1} & \quad (2)\;100\: ms^{-1} \\ (3)\;80\: ms^{-1} & \quad (4)\;40\: ms^{-1} \end {array}$

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