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

Question

( A ) $100 ms^{ –1}$
( B ) $40 ms^{–1}$
( C ) $80 ms^{–1}$
( D ) $120 ms^{ –1}$