A railway flat car, whose mass together with the artillery gun is M, moves at a speed V. The gun barrel makes an angle a with the horizontal. A shell of mass m leaves the barrel at a speed v, relative to the barrel. The speed of the flat car in order that it may stop after the firing is

A railway flat car, whose mass together with the artillery gun is M, m

1.	A railway flat car, whose mass together with the artillery gun is M, moves at a speed V. The gun barrel makes an angle a with the horizontal. A shell of mass m leaves the barrel at a speed v, relative to the barrel. The speed of the flat car in order that it may stop after the firing is
Answer» `(MV COS ALPHA)/(M-m)` `(mv)/(M+m)` `(M+m) V cos alpha` `(Mv cos alpha)/(M+m)` ANSWER :A