[" A loaded spring gun of mass M fires a shot of mass "m" with a velocity "V" at an angle of elevation "],[theta" .The gun is initially at rest on horizontal frictionless surface.Just after firing,the centre of mass "],[" of the gun-shot system: "],[" (A) moves with a velocity "V(m)/(M)],[" (B) moves with a velocity "(Vm)/(M)cos theta" in the horizontal direction "],[" (extemains at rest "quad " (D) None "]