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A shell of mass \( 200 \mathrm{gm} \) is ejected from a gun of mass \( 4 \mathrm{~kg} \) by an explosion that generates \( 1.05 \mathrm{~kJ} \) of energy.
\( \mathrm{P} \) The initial velocity of the shell is

W.
(a) \( 40 \mathrm{~m} \mathrm{~s}^{-1} \)
(b) \( 120 \mathrm{~m} \mathrm{~s}^{-1} \)
(c) \( 100 \mathrm{~m} \mathrm{~s}^{-1} \)
(d) \( 80 \mathrm{~m} \mathrm{~s}^{-1} \)
(2008)
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