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A railway flat car, whose mass together ...

A railway flat car, whose mass together with the artillery gun is `M = 2 m`, moves at a speed `V`. The gun barrel makes an angle `alpha = 60^(@)` with the horizontal. A shell of mass `m` leaves the barrel at a speed `v = 12 ms^(-1)`, relative to the barrel. Find the speed of the flat car `V` (in `ms^(-1)`) in order that it may stop after the firing.

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