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Find an expression for v_0, the initial speed of the fired object.

Express your answer in terms of some or all of the variables m, M, L, and theta and the acceleration due to gravity, g.

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i know that there are two events. the first one is the inelastic collision, where momentum is conserved and mv = (m+M)(V) ... and V = mv/(m+M) ... and when the block swings up mechanical energy is conserved so that (K initial + U initial) = (K final + U final) and (0.5(m+M)V^2) = (m+M)g(h) ... and the bullet speed is ((m+M)/m)(sqrt 2gh) ... how do i incorporate this theta variable that the problem is asking for???

i am so confused!