Initial speed of a bullet

1. The problem statement, all variables and given/known data
A bullet of mass m is fired into a large block of wood, mass M, suspended by two long cords. The bullet comes to rest in the block so that the system swings upwards, coming to rest after travelling through a vertical distance h.
Find in terms of m, M, and h:
the initial speed of the bullet.

2. Relevant equations

3. The attempt at a solution
Do not know where to start.


Homework Helper
Start by using the conservation of momentum to figure out the speed of the block at the bottom of the swing.

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